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652 

WWUS20 KWNS 240420

SEL8

SPC WW 240420

IAZ000-MNZ000-WIZ000-241200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 528

NWS STORM PREDICTION CENTER NORMAN OK

1120 PM CDT FRI JUL 23 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH-CENTRAL AND NORTHEAST IOWA

       SOUTH-CENTRAL AND SOUTHEAST MINNESOTA

       SOUTHWEST WISCONSIN



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1120 PM

UNTIL 700 AM CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST

NORTHWEST OF FAIRMONT MINNESOTA TO 45 MILES EAST SOUTHEAST OF LA

CROSSE WISCONSIN.  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 526...WW 527...



DISCUSSION...MATURE...BOWING MCS IS EXPECTED TO CONTINUE EWD ALONG

IMMEDIATE COOL SIDE OF LOW-LEVEL BAROCLINIC SITUATED NEAR THE MN/IA.

INFLOW AIR MASS REMAINS QUITE WARM AND MOIST WITH MLCAPE OF

2000-2500 J/KG.  WHEN COUPLED WITH 50-60 KT OF DEEP LAYER

SHEAR...ENVIRONMENT SHOULD SUSTAIN THE ORGANIZED MESOSCALE SYSTEM

WITH DAMAGING WINDS LIKELY ALONG IT/S TRACK.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 27040.





...MEAD

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