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WWUS20 KWNS 280122

SEL4

SPC WW 280122

MNZ000-WIZ000-LMZ000-281000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 544

NWS STORM PREDICTION CENTER NORMAN OK

825 PM CDT TUE JUL 27 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR SOUTHEAST MINNESOTA

       CENTRAL WISCONSIN

       LAKE MICHIGAN



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 825 PM

UNTIL 500 AM CDT.



HAIL TO 2 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 NORTHWEST

OF LA CROSSE WISCONSIN TO 25 MILES EAST NORTHEAST OF GREEN BAY

WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 541...WW 542...WW 543...



DISCUSSION...EVOLVING QLCS IS EXPECTED TO CONTINUE SEWD THROUGH THE

REGION TONIGHT IN ADVANCE OF STRONG SHORT WAVE TROUGH PROGRESSING

ESEWD THROUGH THE UPPER MS VALLEY.  INFLOW AIR MASS REMAINS WARM AND

QUITE MOIST WITH MLCAPE OF 2000-3000 J/KG.  WHEN COUPLED WITH 40-45

KT OF DEEP WNWLY SHEAR...ENVIRONMENT WILL FAVOR EMBEDDED BOWING AND

SUPERCELL STRUCTURES WITH THE PRIMARY HAZARD BEING DAMAGING WIND

GUSTS.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 29035.





...MEAD

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