

726 

WWUS20 KWNS 281741

SEL1

SPC WW 281741

NYZ000-VTZ000-290100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 391

NWS STORM PREDICTION CENTER NORMAN OK

145 PM EDT SAT MAY 28 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST NEW YORK

       NORTHERN AND CENTRAL VERMONT



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 145 PM UNTIL

900 PM EDT.



HAIL TO 2 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 55

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES WEST

NORTHWEST OF NEWPORT VERMONT TO 20 MILES EAST SOUTHEAST OF GLENS

FALLS 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.



DISCUSSION...ISOLATE INTENSE THUNDERSTORMS HAVE FORMED OVER EASTERN

NY/WESTERN VT IN LOW LEVEL INSTABILITY AXIS NEAR THE HUDSON RIVER

VALLEY.  THESE STORMS ARE EXPECTED TO PERSIST THROUGH THE AFTERNOON

AND TRACK NORTHEASTWARD ACROSS THE WATCH AREA...AHEAD OF APPROACHING

UPPER TROUGH.  SUFFICIENT DEEP LAYER VERTICAL SHEAR AND CAPE WILL

SUPPORT A RISK OF A LOCALLY DAMAGING WINDS AND HAIL IN THE STRONGER

CELLS.



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 23030.





...HART

