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

Stucki, Peter; Froidevaux, Paul; Zamuriano, Marcelo; Isotta, Francesco Alessandro; Messmer, Martina; Martynov, Andrey

doi:https://doi.org/10.5194/nhess-20-35-2020

Articles | Volume 20, issue 1

https://doi.org/10.5194/nhess-20-35-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/nhess-20-35-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 1

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, Paul Froidevaux, Marcelo Zamuriano, Francesco Alessandro Isotta, Martina Messmer, and Andrey Martynov

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Sep 2019	14	9	0	23
Oct 2019	10	5	1	16
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Feb 2020	76	9	3	88
Mar 2020	25	5	2	32
Apr 2020	25	8	1	34
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Jun 2020	38	12	1	51
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Sep 2020	43	5	0	48
Oct 2020	39	8	1	48
Nov 2020	14	8	1	23
Dec 2020	10	13	0	23
Jan 2021	27	10	0	37
Feb 2021	20	12	1	33
Mar 2021	14	9	0	23
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Feb 2024	7	9	3	19
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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.