

000 

WWUS20 KWNS 011725

SEL7

SPC WW 011725

ILZ000-INZ000-MIZ000-LMZ000-020100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 47

NWS STORM PREDICTION CENTER NORMAN OK

1125 AM CST THU MAR 1 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF NORTHERN ILLINOIS

       NORTHERN INDIANA

       SOUTHWESTERN LOWER MICHIGAN

       LAKE MICHIGAN



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1125 AM UNTIL

700 PM CST.



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 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTH OF

PEORIA ILLINOIS TO 40 MILES NORTH NORTHEAST OF FORT WAYNE

INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 42...WW 43...WW 44...WW

45...WW 46...



DISCUSSION...POWERFUL TROUGH AND DEEP UPPER LOW ROTATING TOWARD

UPPER MS VALLEY. LN OF LOW TOPPED THUNDERSTORMS ARE DEVELOPING ALONG

COLD FRONT WRN IL AND WILL MOVE RAPIDLY NEWD ACROSS WATCH AREA THIS

AFTERNOON.  PRIMARY SEVERE THREAT WILL BE DAMAGING WINDS AND HAIL

ASSOCIATED WITH THE LINE AS IT MOVES ACROSS NRN IL INTO NRN IN AND

SWRN MI.



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 400. MEAN STORM

MOTION VECTOR 22040.





...HALES

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