

975 

WWUS20 KWNS 082002

SEL1

SPC WW 082002

MIZ000-LHZ000-LMZ000-090200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 351

NWS STORM PREDICTION CENTER NORMAN OK

405 PM EDT MON JUN 8 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN LOWER MICHIGAN

       LAKE HURON

       LAKE MICHIGAN



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 405 PM UNTIL

1000 PM 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 85 STATUTE

MILES EAST AND WEST OF A LINE FROM 10 MILES NORTH NORTHEAST OF

SAGINAW MICHIGAN TO 25 MILES WEST SOUTHWEST OF JACKSON 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 350...



DISCUSSION...SCATTERED THUNDERSTORMS ARE DEVELOPING ALONG THE

SURFACE WARM FRONT AS IT CONTINUES TO LIFT NEWD ACROSS SRN LOWER MI

IN ADVANCE OF THE SYNOPTIC LOW AND MID LEVEL TROUGH MOVING ENEWD

FROM WI/IL.  THE BOUNDARY LAYER HAS DESTABILIZED S OF THE WARM FRONT

WHERE TEMPERATURES OF 75-80 F AND MID 60S DEW POINTS ARE RESULTING

IN MODERATE INSTABILITY /MLCAPE OF 1000-1500 J/KG/.

MEANWHILE...VERTICAL SHEAR REMAINS SUFFICIENT FOR SUPERCELLS WITH A

THREAT FOR A COUPLE OF TORNADOES...ESPECIALLY RIGHT ALONG THE

SURFACE WARM FRONT.  IN ADDITION TO THE TORNADO THREAT...THE

STRONGER STORMS WILL PRODUCE LARGE HAIL AND DAMAGING WINDS...WITH A

LARGE HAIL THREAT CONTINUING WITH ELEVATED STORMS N/NE OF THE WARM

FRONT.



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 24030.





...THOMPSON

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