Articles | Volume 20, issue 1
Nat. Hazards Earth Syst. Sci., 20, 35–57, 2020
https://doi.org/10.5194/nhess-20-35-2020
Nat. Hazards Earth Syst. Sci., 20, 35–57, 2020
https://doi.org/10.5194/nhess-20-35-2020
Research article
07 Jan 2020
Research article | 07 Jan 2020

Simulations of the 2005, 1910, and 1876 Vb cyclones over the Alps – sensitivity to model physics and cyclonic moisture flux

Peter Stucki et al.

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Cited articles

Aebischer, U. and Schär, C.: Low-Level Potential Vorticity and Cyclogenesis to the Lee of the Alps, J. Atmos. Sci., 55, 186–207, https://doi.org/10.1175/1520-0469(1998)055<0186:LLPVAC>2.0.CO;2, 1998. 
Awan, N. K. and Formayer, H.: Cutoff low systems and their relevance to large-scale extreme precipitation in the European Alps, Theor. Appl. Climatol., 129, 149–158, https://doi.org/10.1007/s00704-016-1767-0, 2017. 
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Beniston, M.: August 2005 intense rainfall event in Switzerland: Not necessarily an analog for strong convective events in a greenhouse climate, Geophys. Res. Lett., 33, 1–5, https://doi.org/10.1029/2005GL025573, 2006. 
Bezzola, G. R. and Hegg, C.: Ereignisanalyse Hochwasser 2005, Teil 1 – Prozessse, Schäden und erste Einordnung, Bundesamt für Umwelt BAFU, Bern, Switzerland, 2007. 
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Short summary
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.
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