WATCHES: Severe Thunderstorm Watch Number 407

WWUS20 KWNS 241709
SEL7
SPC WW 241709
CTZ000-MAZ000-MEZ000-NHZ000-RIZ000-CWZ000-250000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 407
NWS STORM PREDICTION CENTER NORMAN OK
105 PM EDT THU JUN 24 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

NORTHERN CONNECTICUT
MUCH OF MASSACHUSETTS
SOUTHERN AND WESTERN MAINE
NEW HAMPSHIRE
RHODE ISLAND
COASTAL WATERS

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 105 PM UNTIL
800 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 100
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTHEAST OF
MOUNT WASHINGTON NEW HAMPSHIRE TO 25 MILES SOUTH SOUTHWEST OF NEW
BEDFORD MASSACHUSETTS. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 404...WW 405...WW 406...

DISCUSSION...FRONTAL AND PRE-FRONTAL TSTMS NOW INCREASING IN FAST
WLY FLOW ON S SIDE OF ST LAWRENCE VLY UPR VORT SHOULD CONTINUE E
INTO WW AREA LATER THIS AFTN. 40-50 KT DEEP WLY SHEAR AND
TERRAIN-GENERATED BOUNDARIES SHOULD SUPPORT A FEW SUSTAINED
STORMS/SUPERCELLS. THESE COULD YIELD A FEW SWATHS OF DMGG
WIND/MARGINALLY SVR HAIL. A CONDITIONAL RISK ALSO WILL EXIST FOR A
TORNADO OR TWO IN AREAS WHERE TERRAIN INFLUENCES/LOW LVL BOUNDARY
SEGMENTS KEEP LOW LVL FLOW SLIGHTLY BACKED...MOST LIKELY IN 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 500. MEAN STORM
MOTION VECTOR 27045.

...CORFIDI

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