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Volume 17, issue 7
Nat. Hazards Earth Syst. Sci., 17, 1221–1230, 2017
https://doi.org/10.5194/nhess-17-1221-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/nhess-17-1221-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Nat. Hazards Earth Syst. Sci., 17, 1221–1230, 2017
https://doi.org/10.5194/nhess-17-1221-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/nhess-17-1221-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article 20 Jul 2017
Research article | 20 Jul 2017
Meteorological analysis of flash floods in Artvin (NE Turkey) on 24 August 2015
Hakki Baltaci
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Bulent Oktay Akkoyunlu, Hakki Baltaci, and Mete Tayanc
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Atmospheric, Meteorological and Climatological Hazards
Bias correction of a gauge-based gridded product to improve extreme precipitation analysis in the Yarlung Tsangpo–Brahmaputra River basin
Analysis of the Universal Thermal Climate Index during heat waves in Serbia
Brief Communication: An electrifying atmospheric river – understanding the thunderstorm event in Santa Barbara County during March 2019
Spatiotemporal changes of heat waves and extreme temperatures in the main cities of China from 1955 to 2014
Ambient conditions prevailing during hail events in central Europe
Present and future changes in winter climate indices relevant for access disruptions in Troms, northern Norway
Hydrometeorological droughts in the Miño–Limia–Sil hydrographic demarcation (northwestern Iberian Peninsula): the role of atmospheric drivers
Brief communication: The role of using precipitation or river discharge data when assessing global coastal compound flooding
Estimation of tropical cyclone wind hazards in coastal regions of China
A methodology to conduct wind damage field surveys for high-impact weather events of convective origin
The sensitivity of intense rainfall to aerosol particle loading – a comparison of bin-resolved microphysics modelling with observations of heavy precipitation from HyMeX IOP7a
Brief communication: Hurricane Dorian: automated near-real-time mapping of the “unprecedented” flooding in the Bahamas using synthetic aperture radar
Systematic error analysis of heavy-precipitation-event prediction using a 30-year hindcast dataset
An 18-year climatology of derechos in Germany
Exposure of real estate properties to the 2018 Hurricane Florence flooding
Review Article: A comprehensive review of datasets and methodologies employed to produce thunderstorm climatologies
Modelling global tropical cyclone wind footprints
Remote sensing in an index-based insurance design for hedging economic impacts on rice cultivation
Contribution of personal weather stations to the observation of deep-convection features near the ground
Improving sub-seasonal forecast skill of meteorological drought: a weather pattern approach
Simulations of the 2005, 1910, and 1876 Vb cyclones over the Alps – sensitivity to model physics and cyclonic moisture flux
Changes in flood damage with global warming on the eastern coast of Spain
Probabilistic modelling of the dependence between rainfed crops and drought hazard
Intra-annual variability of the Western Mediterranean Oscillation (WeMO) and occurrence of extreme torrential rainfall in Catalonia (NE Iberia)
Modeling volcanic ash aggregation processes and related impacts on the April/May 2010 eruptions of Eyjafjallajökull Volcano with WRF-Chem
First reported case of thunderstorm asthma in Israel
Meteorological conditions leading to the 2015 Salgar flash flood: lessons for vulnerable regions in tropical complex terrain
Estimates of tropical cyclone geometry parameters based on best-track data
Identifying a transition climate zone in an arid river basin using the evaporative stress index
The impact of lightning and radar reflectivity factor data assimilation on the very short-term rainfall forecasts of RAMS@ISAC: application to two case studies in Italy
Impact of the dry-day definition on Mediterranean extreme dry-spell analysis
Effects of horizontal resolution and air–sea flux parameterization on the intensity and structure of simulated Typhoon Haiyan (2013)
Flood risk in a range of spatial perspectives – from global to local scales
Radar-derived convective storms' climatology for the Prut River basin: 2003–2017
The impact of drought on the productivity of two rainfed crops in Spain
A high-resolution spatial assessment of the impacts of drought variability on vegetation activity in Spain from 1981 to 2015
Chilling accumulation in fruit trees in Spain under climate change
Atmospheric circulation changes and their impact on extreme sea levels around Australia
Synoptic-scale conditions and convection-resolving hindcast experiments of a cold-season derecho on 3 January 2014 in western Europe
Summertime precipitation extremes in a EURO-CORDEX 0.11° ensemble at an hourly resolution
Assessing the impact of sea surface temperatures on a simulated medicane using ensemble simulations
Impact of airborne cloud radar reflectivity data assimilation on kilometre-scale numerical weather prediction analyses and forecasts of heavy precipitation events
Assimilation of wind data from airborne Doppler cloud-profiling radar in a kilometre-scale NWP system
Projected changes to extreme freezing precipitation and design ice loads over North America based on a large ensemble of Canadian regional climate model simulations
High-spatial-resolution probability maps of drought duration and magnitude across Spain
A hazard model of sub-freezing temperatures in the United Kingdom using vine copulas
Projected intensification of sub-daily and daily rainfall extremes in convection-permitting climate model simulations over North America: implications for future intensity–duration–frequency curves
The selection of directional sectors for the analysis of extreme wind speed
Atmospheric conditions of extreme precipitation events in western Turkey for the period 2006–2015
The role of atmospheric rivers in compound events consisting of heavy precipitation and high storm surges along the Dutch coast
Xian Luo, Xuemei Fan, Yungang Li, and Xuan Ji
Nat. Hazards Earth Syst. Sci., 20, 2243–2254, https://doi.org/10.5194/nhess-20-2243-2020, https://doi.org/10.5194/nhess-20-2243-2020, 2020
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In this study, we corrected Asian Precipitation Highly Resolved Observational Data Integration Towards Evaluation of Water Resources (APHRODITE) in the Yarlung Tsangpo–Brahmaputra River Basin using both linear and nonlinear methods, and their influences on resulting extreme precipitation indices were assessed. Results showed that all methods were able to correct mean precipitation, but their ability to correct wet-day frequency and coefficient of variation were markedly different.
Milica M. Pecelj, Milica Z. Lukić, Dejan J. Filipović, Branko M. Protić, and Uroš M. Bogdanović
Nat. Hazards Earth Syst. Sci., 20, 2021–2036, https://doi.org/10.5194/nhess-20-2021-2020, https://doi.org/10.5194/nhess-20-2021-2020, 2020
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The variation in UTCI heat stress grade was observed during heat waves over the past 20 years in order to identify patterns of biothermal heat stress conditions in Serbia.
Very strong heat stressdescribes an alarming biothermal state and has occurred frequently in the last 10 years. The findings indicate the UTCI14 h index
very strong heat stress event(VSHSE) as an indicator of biothermal heat hazard.
Deanna Nash and Leila M. V. Carvalho
Nat. Hazards Earth Syst. Sci., 20, 1931–1940, https://doi.org/10.5194/nhess-20-1931-2020, https://doi.org/10.5194/nhess-20-1931-2020, 2020
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On 6 March 2019, during an atmospheric river (AR) event, over 8000 lightning flashes were recorded near southern California in under 24 h, resulting in a unique meteorological event for this region. This study examines the characteristics of this AR compared to previous landfalling ARs in Santa Barbara and explores how the conditions led to the formation of hail and enhanced electrification in a region that sees little to no lightning.
Kuo Li and Gyilbag Amatus
Nat. Hazards Earth Syst. Sci., 20, 1889–1901, https://doi.org/10.5194/nhess-20-1889-2020, https://doi.org/10.5194/nhess-20-1889-2020, 2020
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In recent years, heat waves have become more frequent in the world, e.g., in Europe, Australia, China and the US, at huge detriment to human health and natural resources. Thus we establish an integrated index of heat waves and extreme-temperature days to provide unified standards for assessing heat waves and hot years. It provides a clear picture of the evolution and spatial distribution of heat waves and hot years in China.
Michael Kunz, Jan Wandel, Elody Fluck, Sven Baumstark, Susanna Mohr, and Sebastian Schemm
Nat. Hazards Earth Syst. Sci., 20, 1867–1887, https://doi.org/10.5194/nhess-20-1867-2020, https://doi.org/10.5194/nhess-20-1867-2020, 2020
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Severe convective storms are major loss drivers across Europe. We reconstructed several thousand storm tracks from radar reflectivity over a 10-year period for parts of Europe. The tracks were additionally combined with hail reports, reanalysis data, and front detections based on ERA-Interim (ECMWF Reanalysis). It is found that frontal hailstorms on average produce larger hailstones and have longer tracks and that wind shear is important not only for the hail diameter but also for track length.
Anita Verpe Dyrrdal, Ketil Isaksen, Jens Kristian Steen Jacobsen, and Irene Brox Nilsen
Nat. Hazards Earth Syst. Sci., 20, 1847–1865, https://doi.org/10.5194/nhess-20-1847-2020, https://doi.org/10.5194/nhess-20-1847-2020, 2020
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We have studied changes in winter weather known to trigger road closures and isolation of small seaside communities in northern Norway. We find that snow amounts and heavy snowfall events have increased in the past, while future projections for 2040–2100 show a decrease in snow-related indices. Events of heavy water supply and zero crossings are expected to increase. Our results imply fewer dry-snow-related access disruptions in the future, while wet-snow avalanches and slushflows may increase.
Rogert Sorí, Marta Vázquez, Milica Stojanovic, Raquel Nieto, Margarida L. R. Liberato, and Luis Gimeno
Nat. Hazards Earth Syst. Sci., 20, 1805–1832, https://doi.org/10.5194/nhess-20-1805-2020, https://doi.org/10.5194/nhess-20-1805-2020, 2020
Emanuele Bevacqua, Michalis I. Vousdoukas, Theodore G. Shepherd, and Mathieu Vrac
Nat. Hazards Earth Syst. Sci., 20, 1765–1782, https://doi.org/10.5194/nhess-20-1765-2020, https://doi.org/10.5194/nhess-20-1765-2020, 2020
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Coastal compound flooding (CF), caused by interacting storm surges and high water runoff, is typically studied based on concurring storm surge extremes with either precipitation or river discharge extremes. Globally, these two approaches show similar CF spatial patterns, especially where the CF potential is the highest. Deviations between the two approaches increase with the catchment size. The precipitation-based analysis allows for considering
local-rainfall-driven CF and CF in small rivers.
Genshen Fang, Lin Zhao, Shuyang Cao, Ledong Zhu, and Yaojun Ge
Nat. Hazards Earth Syst. Sci., 20, 1617–1637, https://doi.org/10.5194/nhess-20-1617-2020, https://doi.org/10.5194/nhess-20-1617-2020, 2020
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Coastal regions of China feature high population densities as well as flexible structures and are therefore vulnerable to tropical cyclone (TC) damage. A TC is a moving rotating storm with a small occurrence rate at a specific site. Wind anemometers are usually damaged during strong typhoon events, making the record of observed winds an unreliable predictor for design wind speed. This study uses the Monte Carlo simulation to investigate the typhoon wind hazards in coastal regions of China.
Oriol Rodríguez, Joan Bech, Juan de Dios Soriano, Delia Gutiérrez, and Salvador Castán
Nat. Hazards Earth Syst. Sci., 20, 1513–1531, https://doi.org/10.5194/nhess-20-1513-2020, https://doi.org/10.5194/nhess-20-1513-2020, 2020
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Post-event damage assessment data are used to study the consequences of natural hazards, such as strong convective winds (i.e. tornadoes, downbursts). The information gathered during fieldwork can be used to characterize those events, which is necessary to build up and maintain robust and homogeneous databases of severe weather cases and high-impact weather events. Accordingly, a methodology to carry out damage surveys of strong-convective-wind events is presented in this article.
Christina Kagkara, Wolfram Wobrock, Céline Planche, and Andrea I. Flossmann
Nat. Hazards Earth Syst. Sci., 20, 1469–1483, https://doi.org/10.5194/nhess-20-1469-2020, https://doi.org/10.5194/nhess-20-1469-2020, 2020
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Over the Cévennes–Vivarais region in southern France, 5 h intensive rainfall covering an area of 1000 km2 with more than 50 mm rain accumulation was observed during IOP7a of HyMeX. This study evaluates the performance of a bin-resolved cloud model for simulating this heavy-precipitation event. The simulation results were compared with observations of rain accumulation, radar reflectivity, temporal and spatial evolution of precipitation, 5 min rain rates, and raindrop size distributions.
Diego Cerrai, Qing Yang, Xinyi Shen, Marika Koukoula, and Emmanouil N. Anagnostou
Nat. Hazards Earth Syst. Sci., 20, 1463–1468, https://doi.org/10.5194/nhess-20-1463-2020, https://doi.org/10.5194/nhess-20-1463-2020, 2020
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On 1 September 2019 Hurricane Dorian made landfall on Great Abaco, unleashing unprecedented destruction on the northern Bahamas. Dorian was characterized by extreme winds, extensive coastal flooding, and impressive precipitation. We studied the event through images acquired by the synthetic aperture radars (SARs) mounted on European Space Agency satellites to derive flooding maps showing the extent of the devastation. We found that the flooded area in the Bahamas was at least 3000 km2.
Matteo Ponzano, Bruno Joly, Laurent Descamps, and Philippe Arbogast
Nat. Hazards Earth Syst. Sci., 20, 1369–1389, https://doi.org/10.5194/nhess-20-1369-2020, https://doi.org/10.5194/nhess-20-1369-2020, 2020
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We assess a methodology to evaluate and improve intense precipitation forecasting in the southeastern French region. This methodology is based on the use of a 30-year dataset of past forecasts which are analysed using a spatial verification approach. We found that precipitation forecasting is qualitatively driven by the deep-convection parametrization. Locally the model is able to reproduce the distribution of spatially integrated rainfall patterns of the most intense precipitation.
Christoph P. Gatzen, Andreas H. Fink, David M. Schultz, and Joaquim G. Pinto
Nat. Hazards Earth Syst. Sci., 20, 1335–1351, https://doi.org/10.5194/nhess-20-1335-2020, https://doi.org/10.5194/nhess-20-1335-2020, 2020
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Derechos are widespread, convectively induced severe wind events. A climatology of derechos in Germany is presented. It shows that derechos are not uncommon across the country. Two seasonal peaks indicate a comparable derecho risk in summer and winter. At the same time, we found two different derecho types, a warm- and a cold-season type. We present characteristics of both derecho types that can help forecasters to estimate the potential derecho threat in a given weather situation.
Marco Tedesco, Steven McAlpine, and Jeremy R. Porter
Nat. Hazards Earth Syst. Sci., 20, 907–920, https://doi.org/10.5194/nhess-20-907-2020, https://doi.org/10.5194/nhess-20-907-2020, 2020
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Quantifying the exposure of house property to extreme weather events is crucial to study their impact on economy. Here, we show that value of property exposed to Hurricane Florence in September 2018 was USD 52 billion vs. USD 10 billion that would have occurred at the beginning of the 19th century due to urban expansion that increased after 1950s and the increasing number of houses built near water, showing the importance of accounting for the distribution of new buildings in risk and exposure.
Leah Hayward, Malcolm Whitworth, Nick Pepin, and Steve Dorling
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2020-25, https://doi.org/10.5194/nhess-2020-25, 2020
Revised manuscript accepted for NHESS
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This review article outlines the state of thunderstorm climatologies, which, are underrepresented in the literature. Thunderstorms overlap with lightning and intense precipitation events, both of which create important hazards. This article compiles and evaluates information on datasets, research approaches and methodologies used in quantifying thunderstorm distribution, providing an introduction to the topic and signposting new and established researchers to research articles and datasets.
James M. Done, Ming Ge, Greg J. Holland, Ioana Dima-West, Samuel Phibbs, Geoffrey R. Saville, and Yuqing Wang
Nat. Hazards Earth Syst. Sci., 20, 567–580, https://doi.org/10.5194/nhess-20-567-2020, https://doi.org/10.5194/nhess-20-567-2020, 2020
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Assessing tropical cyclone (TC) wind risk is challenging due to a lack of historical TC wind data. This paper presents a novel approach to simulating landfalling TC winds anywhere on Earth. It captures local features such as high winds over coastal hills and lulls over rough terrain. A dataset of over 700 global historical wind footprints has been generated to provide new views of historical events. This dataset can be used to advance our understanding of overland TC wind risk.
Omar Roberto Valverde-Arias, Paloma Esteve, Ana María Tarquis, and Alberto Garrido
Nat. Hazards Earth Syst. Sci., 20, 345–362, https://doi.org/10.5194/nhess-20-345-2020, https://doi.org/10.5194/nhess-20-345-2020, 2020
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We designed an index-based insurance (IBI) for drought and flood in rice crops in Babahoyo (Ecuador). We assessed Babahoyo's soil, climatic and topographic variability, finding two homogeneous zones inside this area. We set differentiated insurance premiums according to the particular risk status of each zone. Results demonstrate that this IBI is an efficient risk transfer tool for policyholders. This insurance design could contribute to stabilizing farmers' incomes and rice production.
Marc Mandement and Olivier Caumont
Nat. Hazards Earth Syst. Sci., 20, 299–322, https://doi.org/10.5194/nhess-20-299-2020, https://doi.org/10.5194/nhess-20-299-2020, 2020
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The number of connected personal weather stations has dramatically increased in the last years. These weather stations produce a high number of data that need a thorough quality control to unleash their potential. A novel quality-control algorithm now allows us to take full advantage of these data and observe thunderstorms with fine-scale details that cannot be caught by standard networks. These results pave the way for tremendous advances in both understanding and forecasting thunderstorms.
Doug Richardson, Hayley J. Fowler, Christopher G. Kilsby, Robert Neal, and Rutger Dankers
Nat. Hazards Earth Syst. Sci., 20, 107–124, https://doi.org/10.5194/nhess-20-107-2020, https://doi.org/10.5194/nhess-20-107-2020, 2020
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Models are not particularly skilful at forecasting rainfall more than 15 d in advance. However, they are often better at predicting atmospheric variables such as mean sea-level pressure (MSLP). Comparing a range of models, we show that UK winter and autumn rainfall and drought prediction skill can be improved by utilising forecasts of MSLP-based weather patterns (WPs) and subsequently estimating rainfall using the historical WP–precipitation relationships.
Peter Stucki, Paul Froidevaux, Marcelo Zamuriano, Francesco Alessandro Isotta, Martina Messmer, and Andrey Martynov
Nat. Hazards Earth Syst. Sci., 20, 35–57, https://doi.org/10.5194/nhess-20-35-2020, https://doi.org/10.5194/nhess-20-35-2020, 2020
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In 1876, 1910, and 2005, Switzerland was impacted by extreme rainfall and floods. All events were linked to a Vb cyclone. We test a range of weather model setups (short spinup and standard physics are best) to understand the sensitivity of atmospheric dynamics. The simulated Vb cyclones are (not) well defined for 2005 and 1910 (1876). To reproduce the events, intense moisture flux from the right direction is needed. Storms that slightly deviate from an ideal path produce erroneous precipitation.
Maria Cortès, Marco Turco, Philip Ward, Josep A. Sánchez-Espigares, Lorenzo Alfieri, and Maria Carmen Llasat
Nat. Hazards Earth Syst. Sci., 19, 2855–2877, https://doi.org/10.5194/nhess-19-2855-2019, https://doi.org/10.5194/nhess-19-2855-2019, 2019
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The main objective of this paper is to estimate changes in the probability of damaging flood events with global warming of 1.5, 2 and 3 °C above pre-industrial levels and taking into account different socioeconomic scenarios in two western Mediterranean regions. The results show a general increase in the probability of a damaging event, with larger increments when higher warming is considered. Moreover, this increase is higher when both climate and population change are included.
Andreia F. S. Ribeiro, Ana Russo, Célia M. Gouveia, Patrícia Páscoa, and Carlos A. L. Pires
Nat. Hazards Earth Syst. Sci., 19, 2795–2809, https://doi.org/10.5194/nhess-19-2795-2019, https://doi.org/10.5194/nhess-19-2795-2019, 2019
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This work investigates the dependence between drought hazard and yield anomalies of rainfed cropping systems in the Iberian Peninsula using the copula theory. The applied methodology allows us to estimate the likelihood of wheat and barley loss under drought conditions, and a dependence among extreme values is suggested. From the decision-making point of view this study aims to contribute to the mitigation of drought-related crop failure.
Joan Albert Lopez-Bustins, Laia Arbiol-Roca, Javier Martin-Vide, Antoni Barrera-Escoda, and Marc Prohom
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2019-374, https://doi.org/10.5194/nhess-2019-374, 2019
Revised manuscript accepted for NHESS
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The Western Mediterranean Oscillation index (WeMOi) at daily resolution has proven to constitute an effective tool for analysing the occurrence of episodes of torrential rainfall over eastern Spain. In the present study we selected the extreme torrential episodes (≥ 200 mm/24 h) that took place in Catalonia (NE Iberia) during the 1951–2016 study period. We computed daily WeMOi values and constructed WeMOi calendars. Principal results reveal the occurrence of 50 episodes, are concentrated in autumn.
Sean D. Egan, Martin Stuefer, Peter W. Webley, Taryn Lopez, Catherine F. Cahill, and Marcus Hirtl
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2019-382, https://doi.org/10.5194/nhess-2019-382, 2019
Revised manuscript accepted for NHESS
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The Weather Research Forecasting with Chemistry (WRF-Chem) model was modified to include a volcanic ash aggregation. The modified WRF-Chem model was run with and without aggregation and changes in the model output were measured. Changes in the lifetime of volcanic as a function of the chosen fractal dimension were quantified. A case study using the 2010 eruptions of Eyjafjallajökull revealed that the aggregation modifications result in tephra fallout and ash concentrations near observed values.
Yoav Yair, Yifat Yair, Baruch Rubin, Ronit Confino-Cohen, Yosef Rosman, Eduardo Shachar, and Menachem Rottem
Nat. Hazards Earth Syst. Sci., 19, 2715–2725, https://doi.org/10.5194/nhess-19-2715-2019, https://doi.org/10.5194/nhess-19-2715-2019, 2019
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During severe thunderstorms, cold outflows can eject pollen and dust particles from the surface, releasing allergens and causing
thunderstorm asthmaepidemics in sensitive populations. We report the first case in Israel that occurred on 25 October 2015. The emergency room presentation records from three hospitals in central Israel showed a clear increase in patients with respiratory complaints immediately after the passage of a massive super-cell thunderstorm in the area.
Carlos D. Hoyos, Lina I. Ceballos, Jhayron S. Pérez-Carrasquilla, Julián Sepúlveda, Silvana M. López-Zapata, Manuel D. Zuluaga, Nicolás Velásquez, Laura Herrera-Mejía, Olver Hernández, Gisel Guzmán-Echavarría, and Mauricio Zapata
Nat. Hazards Earth Syst. Sci., 19, 2635–2665, https://doi.org/10.5194/nhess-19-2635-2019, https://doi.org/10.5194/nhess-19-2635-2019, 2019
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On the morning of 18 May 2015, a flash flood in the La Liboriana river basin inundated the town of Salgar, killing more than 100 people. The ultimate goal of science, regarding risk management, is to be able to reduce the number of people affected by severe storms. Our goal is to identify the meteorological conditions that led to the flood, assess the characteristics of the rainfall events before the disaster, and identify lessons for vulnerable regions settled in complex terrains.
Kees Nederhoff, Alessio Giardino, Maarten van Ormondt, and Deepak Vatvani
Nat. Hazards Earth Syst. Sci., 19, 2359–2370, https://doi.org/10.5194/nhess-19-2359-2019, https://doi.org/10.5194/nhess-19-2359-2019, 2019
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Tropical cyclone wind models are often used in engineering applications. However, these models lack the required accuracy when the size of the tropical cyclone is not known. In this paper, new relationships are derived to describe parameters affecting the size. These relationships are formulated using observed data and make it possible to estimate tropical cyclone size and to use this information in tropical cyclone wind models to obtain more reliable estimates of the tropical cyclone winds.
Yongqiang Liu, Lu Hao, Decheng Zhou, Cen Pan, Peilong Liu, Zhe Xiong, and Ge Sun
Nat. Hazards Earth Syst. Sci., 19, 2281–2294, https://doi.org/10.5194/nhess-19-2281-2019, https://doi.org/10.5194/nhess-19-2281-2019, 2019
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A transition zone often exists between a moist upper river reach and an arid lower reach in a watershed with complex topography. This zone is more suitable for human activities but is difficult to identify in climate classification. We found that a hydrological index overpowers a meteorological index in identifying a transition zone of a watershed in northwestern China, indicating the important role of the land-surface processes and human disturbances in formulating the transition zone.
Stefano Federico, Rosa Claudia Torcasio, Elenio Avolio, Olivier Caumont, Mario Montopoli, Luca Baldini, Gianfranco Vulpiani, and Stefano Dietrich
Nat. Hazards Earth Syst. Sci., 19, 1839–1864, https://doi.org/10.5194/nhess-19-1839-2019, https://doi.org/10.5194/nhess-19-1839-2019, 2019
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This study shows the possibility to improve the weather forecast at the very short range (0–3 h) using lightning and/or radar reflectivity observations. We consider two challenging events that occurred over Italy, named Serrano and Livorno, characterized by moderate and exceptional rainfall, respectively.
The improvement given to the forecast by using the lightning and/or radar reflectivity observations is considerable. The best performance is obtained when using both data.
Pauline Rivoire, Yves Tramblay, Luc Neppel, Elke Hertig, and Sergio M. Vicente-Serrano
Nat. Hazards Earth Syst. Sci., 19, 1629–1638, https://doi.org/10.5194/nhess-19-1629-2019, https://doi.org/10.5194/nhess-19-1629-2019, 2019
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In order to define a dry period, a threshold for wet days is usually considered to account for measurement errors and evaporation. In the present study, we compare the threshold of 1 mm d−1, the most commonly used threshold, to a time-varying threshold describing evapotranspiration to compare how the risk of extreme dry spells is estimated with both thresholds. Results indicate that considering a fixed threshold can underestimate extreme dry spells during the extended summer.
Mien-Tze Kueh, Wen-Mei Chen, Yang-Fan Sheng, Simon C. Lin, Tso-Ren Wu, Eric Yen, Yu-Lin Tsai, and Chuan-Yao Lin
Nat. Hazards Earth Syst. Sci., 19, 1509–1539, https://doi.org/10.5194/nhess-19-1509-2019, https://doi.org/10.5194/nhess-19-1509-2019, 2019
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In this study, we show that both the model horizontal resolution and air–sea flux parameterization can exert a large influence on tropical cyclone intensity simulation but with different impacts on wind structures. We highlight the intensification and contraction of the TC eyewall in response to the reduction of grid spacing. We also suggest that a well-developed eyewall is more conducive to the positive effect of flux formulas on TC development.
Zbigniew W. Kundzewicz, Buda Su, Yanjun Wang, Guojie Wang, Guofu Wang, Jinlong Huang, and Tong Jiang
Nat. Hazards Earth Syst. Sci., 19, 1319–1328, https://doi.org/10.5194/nhess-19-1319-2019, https://doi.org/10.5194/nhess-19-1319-2019, 2019
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Considering flood risk composed of hazard, exposure, and vulnerability from global to local scales, this paper reviews and presents increasing observed flood losses and projections of flood hazard and losses. We acknowledge existence of multiple driving factors and of considerable uncertainty, in particular with regards to projections for the future. Finally, this paper analyses options for flood risk reduction from a global framework to regional and local scales.
Sorin Burcea, Roxana Cică, and Roxana Bojariu
Nat. Hazards Earth Syst. Sci., 19, 1305–1318, https://doi.org/10.5194/nhess-19-1305-2019, https://doi.org/10.5194/nhess-19-1305-2019, 2019
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The mapping of convective storms in the area of the transboundary Prut River basin was developed using a 15-year radar dataset (2003–2017). The analysis is based on data sampled in successive 6 min scans of the atmosphere, to detect and track the convective storms. The results highlighted a yearly, monthly, and daily variation of convective activity but also spatial distribution patterns. The study of atmospheric convection is important in assessing the risks associated with extreme weather.
Marina Peña-Gallardo, Sergio Martín Vicente-Serrano, Fernando Domínguez-Castro, and Santiago Beguería
Nat. Hazards Earth Syst. Sci., 19, 1215–1234, https://doi.org/10.5194/nhess-19-1215-2019, https://doi.org/10.5194/nhess-19-1215-2019, 2019
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Drought events are of great importance in most Mediterranean climate regions, and the impacts caused on rainfed crops are particularly evident. In this study the impacts of drought on two representative rainfed crops in Spain (wheat and barley) are assessed by testing various worldwide drought indices and two datasets at different spatial resolution.
Sergio M. Vicente-Serrano, Cesar Azorin-Molina, Marina Peña-Gallardo, Miquel Tomas-Burguera, Fernando Domínguez-Castro, Natalia Martín-Hernández, Santiago Beguería, Ahmed El Kenawy, Iván Noguera, and Mónica García
Nat. Hazards Earth Syst. Sci., 19, 1189–1213, https://doi.org/10.5194/nhess-19-1189-2019, https://doi.org/10.5194/nhess-19-1189-2019, 2019
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Drought is a major driver of vegetation activity in Spain. Here we used a high-resolution remote-sensing dataset spanning the period from 1981 to 2015 to assess the sensitivity of 23 vegetation types to drought across Spain. Results demonstrate that vegetation activity is controlled largely by the interannual variability of drought. Nevertheless, there are some considerable spatio-temporal variations, which can be linked to differences in land cover and aridity conditions.
Alfredo Rodríguez, David Pérez-López, Enrique Sánchez, Ana Centeno, Iñigo Gómara, Alessandro Dosio, and Margarita Ruiz-Ramos
Nat. Hazards Earth Syst. Sci., 19, 1087–1103, https://doi.org/10.5194/nhess-19-1087-2019, https://doi.org/10.5194/nhess-19-1087-2019, 2019
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Growing trees are vulnerable to cold temperatures. Fruit trees stop their growth during the coldest months of the year until meeting a required cold accumulation, specific for each tree species and variety. Under global warming, a reduction in cold accumulation in Spain is projected. This threatens the viability of some current tree crops and varieties in some areas, but other varieties with less requirements can be used. Our results allow adaptation of tree plantations to climate change.
Frank Colberg, Kathleen L. McInnes, Julian O'Grady, and Ron Hoeke
Nat. Hazards Earth Syst. Sci., 19, 1067–1086, https://doi.org/10.5194/nhess-19-1067-2019, https://doi.org/10.5194/nhess-19-1067-2019, 2019
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This study investigates coastal sea level variability and extremes
around Australia, taking into account historical conditions and future
atmospheric changes. Modelling suggests changes in future extreme sea levels may occur. A southward movement of the subtropical ridge leads to reduced sea level extremes in many areas, while changes over the Gulf of Carpentaria are largest and positive during austral summer in two of four simulations, likely associated with changes in the northwest monsoon.
Luca Mathias, Patrick Ludwig, and Joaquim G. Pinto
Nat. Hazards Earth Syst. Sci., 19, 1023–1040, https://doi.org/10.5194/nhess-19-1023-2019, https://doi.org/10.5194/nhess-19-1023-2019, 2019
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Convective systems producing severe winds occasionally affect Europe during wintertime and the majority of these storms develop along well-defined cold fronts of extratropical cyclones. However, on 3 January 2014, a storm formed in a postfrontal air mass over western Europe. This study analyses the prevailing environmental conditions and the predictability of this storm. Our results reveal the difficulty of forecasting cold-season convective storms when they are not associated with a cold front.
Peter Berg, Ole B. Christensen, Katharina Klehmet, Geert Lenderink, Jonas Olsson, Claas Teichmann, and Wei Yang
Nat. Hazards Earth Syst. Sci., 19, 957–971, https://doi.org/10.5194/nhess-19-957-2019, https://doi.org/10.5194/nhess-19-957-2019, 2019
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A state-of-the-art regional climate model ensemble for Europe is investigated for extreme precipitation intensities. The models poorly reproduce short duration events of less than a few hours. Further, there is poor connection to some known hotspots for extreme cases. The model performance is much improved at 12 h durations. Projected future increases scale with seasonal mean temperature change, within a range from a few percent to over 10 percent per degree Celsius.
Robin Noyelle, Uwe Ulbrich, Nico Becker, and Edmund P. Meredith
Nat. Hazards Earth Syst. Sci., 19, 941–955, https://doi.org/10.5194/nhess-19-941-2019, https://doi.org/10.5194/nhess-19-941-2019, 2019
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This paper investigates the formation of the Mediterranean hurricane that developed between Balearic Islands and Sardinia in October 1996, with a particular focus on the influence of sea surface temperature. We show that increased sea surface temperatures lead to greater probabilities of appearance and a greater strength of the resulting hurricane, suggesting that the processes for Mediterranean hurricanes at steady state are very similar to tropical cyclones.
Mary Borderies, Olivier Caumont, Julien Delanoë, Véronique Ducrocq, Nadia Fourrié, and Pascal Marquet
Nat. Hazards Earth Syst. Sci., 19, 907–926, https://doi.org/10.5194/nhess-19-907-2019, https://doi.org/10.5194/nhess-19-907-2019, 2019
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The potential of W-band radar reflectivity to improve the quality of analyses and forecasts of heavy precipitation events in the Mediterranean area is investigated. The 1D + 3DVar assimilation method has been adapted to assimilate the W-band reflectivity in the Météo-France kilometre-scale NWP model AROME. The results suggest that the joint assimilation of W-band reflectivity and horizontal wind profiles lead to a slight improvement of moisture analyses and rainfall precipitation forecasts.
Mary Borderies, Olivier Caumont, Julien Delanoë, Véronique Ducrocq, and Nadia Fourrié
Nat. Hazards Earth Syst. Sci., 19, 821–835, https://doi.org/10.5194/nhess-19-821-2019, https://doi.org/10.5194/nhess-19-821-2019, 2019
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The study reports on the impact of the assimilation of wind data from airborne Doppler cloud-profiling radar in a kilometre-scale NWP model on predicting heavy precipitation events in the Mediterranean area. The positive impact of the assimilation of such data is particularly evidenced for a heavy precipitation event and results are slightly encouraging over a 45-day period. In addition, the impact of the length of the assimilation window in a 3h-3DVar assimilation system is investigated.
Dae Il Jeong, Alex J. Cannon, and Xuebin Zhang
Nat. Hazards Earth Syst. Sci., 19, 857–872, https://doi.org/10.5194/nhess-19-857-2019, https://doi.org/10.5194/nhess-19-857-2019, 2019
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Atmospheric ice accretion caused by freezing precipitation leads to severe damage and failure of buildings and infrastructure. This study investigates projected changes to extreme ice loads used to design infrastructure over North America for future periods of specified global mean temperature change using a Canadian regional climate model. Increases in ice accretion for latitudes higher than 40° N are substantial and would have clear implications for future building and infrastructure design.
Fernando Domínguez-Castro, Sergio M. Vicente-Serrano, Miquel Tomás-Burguera, Marina Peña-Gallardo, Santiago Beguería, Ahmed El Kenawy, Yolanda Luna, and Ana Morata
Nat. Hazards Earth Syst. Sci., 19, 611–628, https://doi.org/10.5194/nhess-19-611-2019, https://doi.org/10.5194/nhess-19-611-2019, 2019
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We mapped – for the first time – the probability of occurrence of drought over Spain, with the overriding aim of improving current drought assessment, management and mitigation measures, and strategies across the region. Spatially, our estimations suggest a higher probability of extreme drought events in southern and central areas of Spain compared to northern and eastern regions. Nevertheless, there are strong differences among drought indices and drought timescales.
Symeon Koumoutsaris
Nat. Hazards Earth Syst. Sci., 19, 489–506, https://doi.org/10.5194/nhess-19-489-2019, https://doi.org/10.5194/nhess-19-489-2019, 2019
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Extended periods of extreme cold weather can cause severe disruptions in human societies, in terms of human health, agriculture, infrastructure, and other factors. A novel statistical model is developed in order to model these extreme cold episodes under different climate conditions. According to the model, the occurrence of extreme cold events has decreased approximately 2 times during the course of the 20th century as a result of anthropogenic climate change.
Alex J. Cannon and Silvia Innocenti
Nat. Hazards Earth Syst. Sci., 19, 421–440, https://doi.org/10.5194/nhess-19-421-2019, https://doi.org/10.5194/nhess-19-421-2019, 2019
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Rainfall intensity–duration–frequency (IDF) curves are used as the basis for water resource infrastructure design. Given intensification of the hydrological cycle with global warming, quantitative information on the future extreme rainfall hazard is needed by practitioners. Projected changes in annual maximum rainfall in high-resolution regional climate model simulations result in IDF curves that shift upward and steepen, with greater intensification at short durations and long return periods.
Pedro Folgueras, Sebastián Solari, and Miguel Ángel Losada
Nat. Hazards Earth Syst. Sci., 19, 221–236, https://doi.org/10.5194/nhess-19-221-2019, https://doi.org/10.5194/nhess-19-221-2019, 2019
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Directional effects are often relevant when studying the extreme values of natural agents, such as wind, waves, or currents. The use of a priori defined divisions is a common but subjective way to address the problem and may not fit data well in certain cases. In this work, a rational method is presented for the selection of directional sectors that, taking into account statistical indicators of the data, leads to the definition of independent and statistically homogeneous sectors.
Bulent Oktay Akkoyunlu, Hakki Baltaci, and Mete Tayanc
Nat. Hazards Earth Syst. Sci., 19, 107–119, https://doi.org/10.5194/nhess-19-107-2019, https://doi.org/10.5194/nhess-19-107-2019, 2019
Nina Ridder, Hylke de Vries, and Sybren Drijfhout
Nat. Hazards Earth Syst. Sci., 18, 3311–3326, https://doi.org/10.5194/nhess-18-3311-2018, https://doi.org/10.5194/nhess-18-3311-2018, 2018
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The simultaneous occurrence of heavy precipitation and high coastal surge levels increases coastal flood risk. This study analyses the driving mechanisms behind these so-called compound events along the Dutch coast. It provides a first classification of events using the presence of atmospheric rivers (long filaments of high water vapour) and identifies differences in the meteorological conditions leading to events that can be used to setup an early warning system for coastal regions.
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This paper investigated the meteorological role of an extraordinary rain event over Artvin. Although alert messages were prepared by the Turkish State Meteorological Service on August 23 at 09:00 UTC, 11 people died and infrastructures, buildings, private property, and public goods were damaged as a result of the flash flood. It is hoped that more detailed studies will be performed on synoptic development leading to extreme summer precipitation events in the eastern Black Sea.
This paper investigated the meteorological role of an extraordinary rain event over Artvin....
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