

485 

WWUS20 KWNS 061325

SEL5

SPC WW 061325

INZ000-MIZ000-LMZ000-061900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 55

NWS STORM PREDICTION CENTER NORMAN OK

930 AM EDT TUE APR 6 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN INDIANA

       SOUTHERN LOWER MICHIGAN

       LAKE MICHIGAN



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 930 AM UNTIL

300 PM EDT.



HAIL TO 2 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST

NORTHWEST OF BENTON HARBOR MICHIGAN TO 10 MILES NORTH OF ANN

ARBOR MICHIGAN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 54...



DISCUSSION...CLUSTER OF INTENSE THUNDERSTORMS OVER SOUTHERN LAKE

MICHIGAN WILL TRACK EASTWARD THIS MORNING ACROSS SOUTHERN LOWER MI

AND NORTHERN IND.  STORMS ARE MOVING ALONG A SURFACE WARM

FRONT...AND ARE PRIMARILY ELEVATED.  THE MAIN THREAT APPEARS TO BE

SEVERE HAIL IN THE STRONGEST CELLS.



AVIATION...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 450. MEAN STORM

MOTION VECTOR 27045.





...HART

