

258 

WWUS20 KWNS 241424

SEL4

SPC WW 241424

CTZ000-MAZ000-MDZ000-NYZ000-PAZ000-VTZ000-WVZ000-242200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 404

NWS STORM PREDICTION CENTER NORMAN OK

1020 AM EDT THU JUN 24 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST CONNECTICUT

       WESTERN MASSACHUSETTS

       FAR WESTERN MARYLAND

       SOUTH CENTRAL AND EASTERN NEW YORK

       SOUTHWEST...CENTRAL...AND NORTHEAST PENNSYLVANIA

       SOUTHERN VERMONT

       NORTHERN WEST VIRGINIA



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1020 AM UNTIL

600 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 70

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

NORTHEAST OF PITTSFIELD MASSACHUSETTS TO 35 MILES WEST NORTHWEST

OF MORGANTOWN WEST VIRGINIA.  FOR A COMPLETE DEPICTION OF THE

WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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...TSTMS EXPECTED TO INCREASE IN COVERAGE/STRENGTH OVER

THE NEXT SEVERAL HOURS ALONG AND AHEAD OF DIFFUSE COLD FRONT AND

ASSOCIATED UPR IMPULSE MOVING RAPIDLY E ACROSS THE LWR GRT LKS.

LARGELY UNIDIRECTIONAL MEAN WLY FLOW AOA 40 KTS /50-60 KTS AT 500

MB/ AND LACK OF STRONG LOW LVL CONVERGENCE SUGGEST LIKELIHOOD FOR

SCTD SUPERCELLS.  THESE MAY ORGANIZE INTO SHORT BANDS/BROKEN LINES.

ATTENDANT BOWING SEGMENTS MAY YIELD SWATHS OF DMGG WIND AND PERHAPS

A BRIEF TORNADO OR TWO GIVEN INCREASING LOW LVL INSTABILITY.



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

