Monday, August 20, 2007

MESO: Mesoscale Discussion 1824

ACUS11 KWNS 210035
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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