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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 121

NWS STORM PREDICTION CENTER NORMAN OK

620 PM EDT SUN APR 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN LOWER MICHIGAN

       LAKE HURON

       LAKE MICHIGAN



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 620 PM UNTIL

200 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 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES EAST NORTHEAST OF

PELLSTON MICHIGAN TO 25 MILES SOUTHWEST OF HOUGHTON LAKE

MICHIGAN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 120...



DISCUSSION...CLUSTER OF ELEVATED SUSTAINED TSTMS...NOW OVER

CNTRL/NRN LK MI...EXPECTED TO CONTINUE ENE ACROSS NRN LWR MI THROUGH

REMAINDER OF EVE...WITH ADDITIONAL DEVELOPMENT POSSIBLE AS

ASSOCIATED AREA OF ASCENT INTERACTS WITH SLOWLY-MOVING WARM FRONT

OVER REGION.  GIVEN STRONG DEEP WIND FIELD...AND LIKELIHOOD FOR

FURTHER STRENGTHENING OF WINDS THIS EVE...POTENTIAL WILL EXIST FOR

SUPERCELLS.  IN ADDITION...WITH BOUNDARY LAYER S OF WARM FRONT IN

LWR MI HAVING WARMED THROUGH THE DAY...POTENTIAL ALSO WILL EXIST FOR

STORMS TO BECOME SURFACE BASED.  THUS...A THREAT MAY DEVELOP FOR

ISOLD TORNADOES IN ADDITION TO HAIL AND DMGG WIND.



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 25045.





...CORFIDI

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