

000 

WWUS20 KWNS 191923

SEL1

SPC WW 191923

CTZ000-MAZ000-NYZ000-VTZ000-200300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 421

NWS STORM PREDICTION CENTER NORMAN OK

325 PM EDT TUE JUN 19 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF WESTERN CONNECTICUT

       PARTS OF WESTERN MASSACHUSETTS

       MUCH OF EASTERN NEW YORK

       VERMONT



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 325 PM UNTIL

1100 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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF

BURLINGTON VERMONT TO 20 MILES EAST SOUTHEAST OF MONTICELLO NEW

YORK.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 417...WW 418...WW

419...WW 420...



DISCUSSION...THUNDERSTORMS WILL CONTINUE TO INCREASE IN NUMBER AND

INTENSITY ACROSS WATCH AREA AS MDTLY UNSTABLE AIR MASS CONTINUES TO

HEAT.  WITH APPROACH OF UPPER TROUGH...SHEAR WILL INCREASE WITH

STORMS EVOLVING INTO SHORT LINE SEGMENTS ENHANCING PRIMARILY WIND

DAMAGE POTENTIAL.



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 25025.





...HALES

