MESO: Mesoscale Discussion 1771

ACUS11 KWNS 010111
SWOMCD
SPC MCD 010111
IAZ000-MNZ000-010245-

MESOSCALE DISCUSSION 1771
NWS STORM PREDICTION CENTER NORMAN OK
0811 PM CDT TUE AUG 31 2010

AREAS AFFECTED...CNTRL THROUGH NERN IA

CONCERNING...SEVERE THUNDERSTORM WATCH 638...

VALID 010111Z - 010245Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 638
CONTINUES.

AT LEAST A MODEST THREAT FOR ISOLATED DAMAGING WIND WILL PERSIST
NEXT COUPLE HOURS FROM CNTRL THROUGH NERN IA.

AS OF 01Z SQUALL LINE EXTENDS FROM WRN WI SWWD THROUGH W CNTRL IA.
ANOTHER LINE OF MORE INTENSE STORMS EXTENDS FROM SWRN IA INTO NERN
KS...REF SWO MCD 1770. NRN LINE IS MOVING EAST AT 20-30 KT...BUT
SWRN PORTION OF THIS LINE HAS SLOWED ITS EWD PROGRESS. STRATUS THAT
DEVELOPED BELOW AN INVERSION NEVER MIXED OUT DURING THE DAY WHICH
HAS LIMITED DESTABILIZATION OF THE BOUNDARY LAYER AND OVERALL SEVERE
POTENTIAL. NEVERTHELESS...STORMS WILL LIKELY CONTINUE DEVELOPING
ALONG SEWD ADVANCING CONVECTIVE OUTFLOW AND THROUGH AXIS OF MODERATE
INSTABILITY WITH A THREAT OF ISOLATED WET DOWNBURSTS NEXT COUPLE
HOURS. SEVERE THREAT IS EXPECTED TO WANE LATER THIS EVENING AS
STORMS APPROACH ERN IA WHERE THE ATMOSPHERE IS LESS UNSTABLE AND
VERTICAL SHEAR IS WEAKER.

..DIAL.. 09/01/2010

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

ATTN...WFO...DVN...ARX...DMX...

LAT...LON 41829404 42439313 43169183 43509126 42949118 41479288
41829404

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