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Classification of Synoptic Conditions of Summer Floods in Polish Sudeten Mountains

1
Department of Climatology, Adam Mickiewicz University, 61-680 Poznań, Poland
2
Department of Hydrology and Water Management, Adam Mickiewicz University, 61-680 Poznań, Poland
*
Author to whom correspondence should be addressed.
Water 2019, 11(7), 1450; https://doi.org/10.3390/w11071450
Received: 24 May 2019 / Revised: 12 July 2019 / Accepted: 12 July 2019 / Published: 13 July 2019
(This article belongs to the Special Issue Effects of Oceanic-Atmospheric Oscillations on Rivers)
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Abstract

Atmospheric processes leading to extreme floods in the Polish Sudeten Mountains were described in this study. A direct impact of heavy precipitation on extremely high runoff episodes was confirmed, and an essential role of synoptic conditions in triggering abundant rainfall was proved. Synoptic conditions preceding each flood event were taken into consideration and the evolution of the pressure field as well as the moisture transport was investigated using the anomaly-based method. Maps of anomalies, constructed for the days prior to floods, enabled recognizing an early formation of negative centers of sea level pressure and also allowed distinguishing areas of positive departures of precipitable water content over Europe. Five cyclonic circulation patterns of different origin, and various extent and intensity, responsible for heavy, flood-triggering precipitation in the Sudetes, were assigned. Most rain-bringing cyclones form over the Mediterranean Sea and some of them over the Atlantic Ocean. A meridional southern transport of moisture was identified in most of the analyzed cases of floods. Recognizing the specific meteorological mechanisms of precipitation enhancement, involving evolution of pressure patterns, change in atmospheric moisture and occurrence of precipitation may contribute to a better understanding of the atmospheric forcing of floods in mountain areas and to improve predicting thereof. View Full-Text
Keywords: Sudeten Mountains; flood; extreme precipitation; atmospheric circulation; synoptic conditions; sea level pressure; cyclone tracks; precipitable water Sudeten Mountains; flood; extreme precipitation; atmospheric circulation; synoptic conditions; sea level pressure; cyclone tracks; precipitable water
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Bednorz, E.; Wrzesiński, D.; Tomczyk, A.M.; Jasik, D. Classification of Synoptic Conditions of Summer Floods in Polish Sudeten Mountains. Water 2019, 11, 1450.

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