

734 

WWUS20 KWNS 291922

SEL1

SPC WW 291922

CTZ000-MAZ000-NYZ000-PAZ000-VTZ000-300300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 241

NWS STORM PREDICTION CENTER NORMAN OK

320 PM EDT WED MAY 29 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHWEST CONNECTICUT

  WESTERN MASSACHUSETTS

  NEW YORK

  NORTHERN PENNSYLVANIA

  SOUTHERN VERMONT



* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 320 PM

  UNTIL 1100 PM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 100

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES SOUTH OF

BINGHAMTON NEW YORK TO 50 MILES NORTHEAST OF UTICA NEW YORK.  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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 239...WW 240...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY ACROSS THE WATCH AREA THIS AFTERNOON INTO EVENING AS

REGION IS GLANCED BY A SHORT-WAVE TROUGH PASSING TO THE NORTH.

DAYTIME HEATING COUPLED WITH BOUNDARY LAYER DEWPOINTS IN THE LOW TO

MID 60S HAS YIELDED A MODERATELY UNSTABLE AIR MASS WITH MLCAPE

VALUES OF 1000-2000 J/KG.  THIS INSTABILITY COINCIDES WITH A

KINEMATIC ENVIRONMENT FEATURING A RELATIVELY STRONG WSWLY WIND

FIELD.  AS SUCH...THE POTENTIAL WILL EXIST FOR SUPERCELLS AND BOWS

CAPABLE OF DAMAGING WINDS...LARGE HAIL...AND PERHAPS A TORNADO.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 28030.





...MEAD

