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WWUS20 KWNS 260148

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 522

NWS STORM PREDICTION CENTER NORMAN OK

950 PM EDT WED JUL 25 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN LOWER MICHIGAN

       LAKE HURON



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 950 PM

UNTIL 500 AM EDT.



HAIL TO 1.5 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHWEST OF

BAD AXE MICHIGAN TO 15 MILES SOUTHEAST OF ANN ARBOR MICHIGAN.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 518...WW 519...WW 520...



DISCUSSION...COMPLEX MCS EVOLUTION IS ONGOING TONIGHT ACROSS

PORTIONS OF LAKE MI INTO NWRN LOWER MI.  AHEAD OF THIS ACTIVITY...A

STRENGTHENING NOCTURNAL LOW-LEVEL WIND MAXIMUM WILL ENHANCE THE EWD

ADVECTION OF THERMODYNAMIC ENVIRONMENT SAMPLED BY 00Z GRB SOUNDING

INTO THE REGION.  AT THE SAME TIME...DEEP WLY/WNWLY FLOW WILL

STRENGTHEN WITH SETUP BECOMING INCREASINGLY SUPPORTIVE OF A

WIDESPREAD DAMAGING WIND EVENT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29040.





...MEAD

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