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WWUS20 KWNS 251915

SEL1

SPC WW 251915

MEZ000-NHZ000-VTZ000-CWZ000-260300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 361

NWS STORM PREDICTION CENTER NORMAN OK

310 PM EDT TUE JUN 25 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  MAINE

  NEW HAMPSHIRE

  VERMONT

  COASTAL WATERS



* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 310 PM UNTIL

  1100 PM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL

    EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH

NORTHWEST OF CARIBOU MAINE TO 30 MILES SOUTH SOUTHEAST OF LEBANON

NEW HAMPSHIRE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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...SCATTERED DISCRETE STORM DEVELOPMENT IS NOW WELL

UNDERWAY ACROSS MUCH OF NORTHERN NEW ENGLAND...PERHAPS AIDED BY

FAVORABLE LARGE-SCALE ASCENT ON THE SOUTHERN PERIPHERY OF A SHORT

WAVE IMPULSE TURNING EASTWARD ACROSS QUEBEC.  THIS IS WHERE 30-50 KT

WESTERLY 500 MB FLOW IS CONTRIBUTING TO SUFFICIENT SHEAR FOR

SUSTAINED ROTATION WITHIN UPDRAFTS.  A FEW SUPERCELLS APPEAR

LIKELY...WITH AN ENHANCED RISK FOR SEVERE HAIL...AND A LOCALIZED

POTENTIALLY DAMAGING WIND GUSTS.  AN ISOLATED TORNADO MAY NOT BE

COMPLETELY OUT OF THE QUESTION.



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 500. MEAN STORM

MOTION VECTOR 27025.





...KERR

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