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WWUS20 KWNS 251737

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 221

NWS STORM PREDICTION CENTER NORMAN OK

140 PM EDT TUE MAY 25 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL MAINE

       COASTAL WATERS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 140 PM UNTIL

800 PM EDT.



HAIL TO 1 INCH 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 65

STATUTE MILES EITHER SIDE OF A LINE FROM 50 MILES EAST NORTHEAST

OF BAR HARBOR MAINE TO 115 MILES WEST NORTHWEST OF HOULTON MAINE.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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.



DISCUSSION...A LINE OF THUNDERSTORMS HAS FORMED ALONG A COLD FRONT

AND THIS CONVECTION WILL MOVE INTO MAINE OVER THE NEXT FEW HOURS.

WEAK-MODERATE INSTABILITY IS PRESENT DOWNSTREAM FROM THIS

CONVECTION...AND LOW-MIDLEVEL FLOW WILL INCREASE AS A SPEED MAX

CRESTS THE RIDGE AND MOVES SEWD OVER NRN MAINE THIS AFTERNOON.

GIVEN THE LINEAR CONVECTIVE MODE AND STEEP LOW-LEVEL LAPSE RATES...A

FEW DAMAGING GUSTS WILL BE POSSIBLE THROUGH THE AFTERNOON.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION

VECTOR 32035.





...THOMPSON

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