FLASH FLOODS IN NE MORAVIA
IN JUNE 2009


SYNOPTIC SITUATION
•Eastern cyclonic circulation
•Position and stacionarity of preasure systems, high temperature, high relative humidity

FLASH FLOODS
•Good conditions for creating convection
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•Saturation of soil
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•Low clouds enhancing the precipitation

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FLASH FLOODS NEAR NOVÝ JIČÍN
•THE CONVECTIVE CELLS  - 50 Dbz
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• -not too massive targets (50 dBZ)
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• -problem 1: TRAIN EFFECT (renewation, movement to SW - along the convergence line)
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• -problem 2: probably partially orographically

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•Periodicity of maximal daily sums of precipitation
• 20. 6. – 6. 7. 2009


•Periodicity of 3-hour sum of precipitation
• 20. 6. – 6. 7. 2013


•Night 24th – 25th June 2009
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•Catchments of the Jičínka creek and the Luha creek
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•Jičínka (L = 25,8 km, A = 113,9 km2)
•Luha (L = 29,2 km, A= 95,6 km2)
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•The catchments had been already saturated
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•The precipitation fell on the middle segments of the catchments (max. 123,8 mm) → 24th June
evening during 2-3 hours!

•Streams could not catch so much water…






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jicinka by JP


•Lower donw the stream the water empyes into the Oder river which is somewhat greater and streams
through wider floodplain with grasslands and forests (the Poodří landscape protected park) →
transformation of the flood → max. Q in Ostrava one day later, N=2.
File:CHKO Poodří, letecký pohled (04).jpg

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http://www.sezev-reko.cz/imgvar/00/00/07/B5
http://www.infoportaly.cz/public/images/foto_clanku/1289/stredni-1-povoden-2009-den-2-jesenik-nad-o
drou-zaziva-tragedii.jpg http://www.letecke-snimky.cz/files/2/6801/cache/Povoden%20(14).jpg

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•Thank you for your attention!
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http://www.zelpage.cz/news_n/vlad230.jpg