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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 518

NWS STORM PREDICTION CENTER NORMAN OK

730 PM EDT THU JUL 22 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF SOUTHERN LOWER MICHIGAN

       LAKE MICHIGAN



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 730 PM

UNTIL 300 AM EDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

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

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH OF MUSKEGON

MICHIGAN TO 30 MILES EAST NORTHEAST OF JACKSON MICHIGAN.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 516. WATCH NUMBER 516 WILL NOT BE IN EFFECT AFTER

730 PM EDT. CONTINUE...WW 514...WW 515...WW 517...



DISCUSSION...A BAND OF TORNADIC SUPERCELLS OVER SERN WI AND SRN LAKE

MI IS EXPECTED TO MOVE/DEVELOP INTO REGION TONIGHT IN CONJUNCTION

WITH A LOW AMPLITUDE MIDLEVEL IMPULSE TRANSLATING EWD.  DESPITE

EARLIER STORMS WHICH HAVE NOW MOVED INTO NWRN OH...THE NEWD

DEVELOPMENT OF A 40-50 KT SWLY LLJ WILL SERVE TO ENHANCE MOISTURE

AND HEAT FLUX INTO THE AREA...EFFECTIVELY SUPPORTING A DESTABILIZING

AND STRONGLY SHEARED ENVIRONMENT.  AS SUCH...THE THREAT FOR

SUPERCELLS CAPABLE OF A FEW TORNADOES...HAIL AND DAMAGING WINDS WILL

INCREASE FROM W-E ACROSS THE AREA TONIGHT.



AVIATION...TORNADOES AND 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 28035.





...MEAD

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