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586 

WWUS20 KWNS 231921

SEL1

SPC WW 231921

MEZ000-NHZ000-VTZ000-CWZ000-240300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 351

NWS STORM PREDICTION CENTER NORMAN OK

320 PM EDT SUN JUN 23 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHWESTERN MAINE

  NEW HAMPSHIRE

  EASTERN VERMONT

  COASTAL WATERS



* EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 320 PM UNTIL

  1100 PM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST

SOUTHWEST OF MONTPELIER VERMONT TO 15 MILES SOUTH OF PORTLAND

MAINE.  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...A GRADUAL CONSOLIDATION OF THUNDERSTORM ACTIVITY INTO A

SMALL MESOSCALE CONVECTIVE SYSTEM APPEARS POSSIBLE DURING THE NEXT

COUPLE OF HOURS EAST SOUTHEAST OF THE CHAMPLAIN VALLEY.  A BELT OF

20-30 KT WEST NORTHWESTERLY DEEP LAYER MEAN FLOW ACROSS THIS REGION

WILL CONTRIBUTE TO PROPAGATION ACROSS PARTS OF CENTRAL VERMONT AND

NEW HAMPSHIRE...TOWARD SOUTHERN MAINE COASTAL AREAS...WITH A RISK

FOR POTENTIALLY DAMAGING WIND GUSTS...PERHAPS SOME HAIL.



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 450. MEAN STORM

MOTION VECTOR 29025.





...KERR

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