

077 

WWUS20 KWNS 230203

SEL8

SPC WW 230203

IAZ000-MNZ000-WIZ000-231100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 388

NWS STORM PREDICTION CENTER NORMAN OK

900 PM CDT TUE JUN 22 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF IOWA

       SOUTHERN MINNESOTA

       WESTERN WISCONSIN



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 900 PM

UNTIL 600 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHWEST OF

MINNEAPOLIS MINNESOTA TO 10 MILES EAST OF LAMONI IOWA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 382...WW 383...WW

385...WW 386...WW 387...



DISCUSSION...ELEVATED THUNDERSTORMS HAD RECENTLY DEVELOPED OVER

PORTIONS OF NRN IA AND ARE EXPECTED TO SLOWLY INCREASE IN COVERAGE

AND INTENSITY AS LOW LEVEL JET STRENGTHENS. STRONG DEEP LAYER SHEAR

WILL BE FAVORABLE FOR MID LEVEL ROTATION AND LARGE HAIL DURING THE

NEXT SEVERAL HOURS. LATER TONIGHT...ONE OR TWO LINEAR MCS/S ARE

EXPECTED TO DEVELOP OVER PORTIONS OF SD/NEB AND SURGE RAPIDLY EWD

INTO THE WW AREA AFTER 06Z. WIND DAMAGE IS EXPECTED TO BE THE

GREATEST THREAT WITH THIS LINE OF STORMS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 24025.





...IMY

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