

831 

WWUS20 KWNS 281747

SEL7

SPC WW 281747

CTZ000-MAZ000-NHZ000-NJZ000-NYZ000-RIZ000-CWZ000-290100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 427

NWS STORM PREDICTION CENTER NORMAN OK

145 PM EDT MON JUN 28 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CONNECTICUT

       MASSACHUSETTS

       SOUTHERN NEW HAMPSHIRE

       EXTREME NORTHEAST NEW JERSEY

       SOUTHEAST NEW YORK

       RHODE ISLAND

       COASTAL WATERS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 145 PM UNTIL 900

PM EDT.



HAIL TO 1 INCH 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 60

STATUTE MILES EITHER SIDE OF A LINE FROM 25 MILES WEST SOUTHWEST

OF NEWARK NEW JERSEY TO 40 MILES EAST OF BOSTON 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 426...



DISCUSSION...DEEPENING CUMULUS CONVECTION IN VISIBLE IMAGERY AND

SURFACE TEMPERATURES IN THE 90S ACROSS INTERIOR SRN NEW ENGLAND

SUGGEST THAT THUNDERSTORM DEVELOPMENT IS LIKELY WITHIN THE NEXT 1-2

HOURS.  GIVEN 35-45 KT WSWLY MIDLEVEL FLOW AND MODERATE

INSTABILITY...ORGANIZED MULTICELL CLUSTERS AND EMBEDDED

BOWS/SUPERCELLS WILL BE CAPABLE OF PRODUCING DAMAGING GUSTS THROUGH

THE AFTERNOON/EVENING AS STORMS INCREASE IN COVERAGE AND SPREAD

TOWARD THE COAST.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

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

VECTOR 26035.





...THOMPSON

