Thursday, June 21, 2007

MESO: Mesoscale Discussion 1241

ACUS11 KWNS 212025
SWOMCD
SPC MCD 212025
WIZ000-ILZ000-IAZ000-MNZ000-212100-

MESOSCALE DISCUSSION 1241
NWS STORM PREDICTION CENTER NORMAN OK
0325 PM CDT THU JUN 21 2007

AREAS AFFECTED...SRN MN/SWRN WI/MUCH OF IA

CONCERNING...SEVERE THUNDERSTORM WATCH 434...

VALID 212025Z - 212100Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 434
CONTINUES.

VERY STRONG INSTABILITY /MLCAPE 3000 J/KG/ AND EFFECTIVE BULK SHEAR
VALUES OF 40-50 KT FROM SRN MN INTO CENTRAL IA WILL CONTINUE TO
SUPPORT ADDITIONAL SEVERE TSTMS ALONG AND IN ADVANCE OF FORWARD
PROPAGATING MCS.

GIVEN CURRENT TRENDS WITH REGIONAL RADAR IMAGERY...WW 434 MAY NEED
TO BE LOCALLY EXTENDED IN AREAL COVERAGE SWD INTO PARTS OF SRN IA
/ONE OR TWO TIERS OF COUNTIES/. IF ACTIVITY CONTINUES TO TRACK MORE
SEWD WITH TIME...A NEW WW MAY BE NEEDED INTO SRN IA AND NWRN IL.

.PETERS.. 06/21/2007

..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MKX...DVN...ARX...MPX...DMX...FSD...OAX...

41579034 41359226 41329520 41629607 42169562 42739503
44009484 44489555 44899524 44959362 44599175 44199012
42199013

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