SWOMCD
SPC MCD 210035
IAZ000-NEZ000-210200-
MESOSCALE DISCUSSION 1824
NWS STORM PREDICTION CENTER NORMAN OK
0735 PM CDT MON AUG 20 2007
AREAS AFFECTED...EASTERN NEB/FAR WESTERN IA
CONCERNING...TORNADO WATCH 623...
VALID 210035Z - 210200Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 623 CONTINUES.
TORNADO WATCH 623 CONTINUES UNTIL 03Z ACROSS EASTERN NEB/FAR WESTERN
IA...WITH CONTINUED POTENTIAL FOR LARGE HAIL/DAMAGING WINDS AND
PERHAPS A TORNADO OR TWO.
A NUMBER OF SEVERE STORMS...WITH HISTORY OF LARGE HAIL AND SEVERE
WIND GUSTS...WILL CONTINUE TO IMPACT A LARGE PART OF EAST
CENTRAL/SOUTHEAST NEB INTO FAR WESTERN IA OVER THE NEXT COUPLE OF
HOURS. OF NOTE...A 71 KT GUST WAS RECENTLY MEASURED AT LINCOLN. IN
ADDITION TO LARGE HAIL/POTENTIALLY A TORNADO...CONSOLIDATING COLD
POOLS/LINEAR EVOLUTION ACROSS EAST CENTRAL/SOUTHEAST NEB SHOULD
YIELD AN INCREASING/POTENTIALLY MORE WIDESPREAD DAMAGING WIND THREAT
OVER THE NEXT 1-2 HOURS. THIS INCLUDES THE OMAHA METRO IN THE SHORT
TERM...AS WELL AS OTHER LOCALES ALONG/EAST OF THE MISSOURI RIVER
INTO FAR WESTERN IA. 00Z OBSERVED OMAHA SOUNDING SUGGESTS THE
DOWNSTREAM ENVIRONMENT ACROSS FAR EASTERN NEB/WESTERN IA REMAINS
PRIMED FOR SEVERE STORMS VIA VERY UNSTABLE MLCAPE OF 4500 J/KG AND
AMPLE LOW LEVEL SRH/DEEP LAYER FLOW. PENDING CONVECTIVE TRENDS...A
REPLACEMENT WATCH IS BEING CONSIDERED FROM EASTERN NEB INTO CENTRAL
IA.
.GUYER.. 08/21/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...DMX...FSD...OAX...GID...
40769857 42369736 42579491 42009390 40879418 40719584
40089589 40089754 40169834
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