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406 

WWUS20 KWNS 222314

SEL7

SPC WW 222314

ILZ000-INZ000-MIZ000-LMZ000-230700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 747

NWS STORM PREDICTION CENTER NORMAN OK

615 PM EST MON NOV 22 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEAST ILLINOIS

       NORTHERN AND WESTERN INDIANA

       WESTERN AND SOUTHERN LOWER MICHIGAN

       LAKE MICHIGAN



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 615 PM UNTIL

200 AM EST.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES EAST OF BLOOMINGTON

ILLINOIS TO 40 MILES NORTHEAST OF ROBEN HOOD MICHIGAN.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 744...WW 745...WW 746...



DISCUSSION...COLD FRONTAL AND PRE-FRONTAL STORMS NOW OVER LK MI AND

CNTRL/NRN IL EXPECTED TO CONTINUE MOVING/DEVELOPING ENEWD AS FRONT

STRENGTHENS WITH THE APPROACH OF UPSTREAM SHORTWAVE IMPULSE.  WHILE

LOW LVL BUOYANCY WILL DIMINISH WITH NIGHTFALL...STRENGTH OF BOTH

LOW-LVL AND DEEP SHEAR SUGGESTS POSSIBILITY FOR SUPERCELLS AND EVEN

A COUPLE TORNADOES AS THE STORMS EVOLVE INTO BROKEN LINE

SEGMENTS/LEWPS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400.

MEAN STORM MOTION VECTOR 24055.





...CORFIDI

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