

050 

WWUS20 KWNS 172022

SEL8

SPC WW 172022

MEZ000-NHZ000-180400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 418

NWS STORM PREDICTION CENTER NORMAN OK

420 PM EDT WED JUL 17 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHERN AND CENTRAL MAINE

  NORTHERN AND CENTRAL NEW HAMPSHIRE



* EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 420 PM UNTIL MIDNIGHT

  EDT.



* PRIMARY THREATS INCLUDE...

  NUMEROUS DAMAGING WIND GUSTS TO 70 MPH LIKELY

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES NORTHWEST

OF MOUNT WASHINGTON NEW HAMPSHIRE TO 10 MILES EAST NORTHEAST OF

CARIBOU MAINE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 416...WW 417...



DISCUSSION...TSTMS NOW FORMING IN ZONE OF WAA ALONG WEAK WARM FRONT

IN ERN ME/WRN NB EXPECTED TO INCREASE THROUGH THE REMAINDER OF THE

AFTN. AMPLE DEEP SHEAR/BUOYANCY EXIST IN THE REGION FOR A FEW

SUSTAINED STORMS/POSSIBLE SUPERCELLS WITH LARGE HAIL...HIGH

WIND...AND POSSIBLY A TORNADO. ADDITIONAL STORMS LIKELY WILL AFFECT

NRN ME AND NH LATER THIS EVE AS UPSTREAM SQLN CONTINUES TO EVOLVE

DOWNSTREAM FROM SHORTWAVE IMPULSE CROSSING THE UPR RGT LKS. THIS

ACTIVITY MAY POSE A SOMEWHAT MORE WIDESPREAD SVR THREAT...MAINLY IN

THE FORM OF LOCALLY DMGG WIND...THIS EVE INTO TNGT AS THE STORMS

MOVE/DEVELOP MAINLY ESE WITH STRENGTHENING DEEP WIND FIELD.



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 31025.





...CORFIDI

