

096 

WWUS20 KWNS 231914

SEL8

SPC WW 231914

MEZ000-240100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 678

NWS STORM PREDICTION CENTER NORMAN OK

315 PM EDT SAT JUL 23 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN MAINE



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 315 PM UNTIL

900 PM EDT.



HAIL TO 1.5 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 EAST AND WEST OF A LINE FROM 45 MILES NORTHWEST OF

CARIBOU MAINE TO 50 MILES WEST SOUTHWEST OF HOULTON MAINE.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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...STORMS CONTINUE TO INCREASE ALONG/AHEAD OF A SEWD

MOVING COLD FRONT ACROSS QUEBEC...IN ADVANCE OF A STRONG SHORT WAVE

TROUGH AND ASSOCIATED MID/UPPER LEVEL JET STREAK.  STEEP LAPSE RATES

AND CONTINUED STRONG HEATING WILL ENHANCE THREAT FOR DAMAGING WIND

GUSTS AS THE LINE MOVES SEWD INTO NRN MAINE.



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 27040.





...WEISS

