MESOSCALE DISCUSSION 1809
   NWS STORM PREDICTION CENTER NORMAN OK
   0630 PM CDT FRI JUL 18 2008
   
   AREAS AFFECTED...EASTERN NY AND MA/CT/NH/VT/WESTERN MAINE
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 698...
   
   VALID 182330Z - 190100Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 698
   CONTINUES.
   
   SEVERE TSTM WATCH 698 IS SCHEDULED TO EXPIRE AT 00Z...WITH A
   DIMINISHING CONVECTIVE INTENSITY TREND EXPECTED THE REMAINDER OF THE
   EVENING. EVEN SO...PORTIONS OF THE WATCH /MAINLY NORTHEAST NY AND
   PORTIONS OF MA/ MAY NEED TO BE CONSIDERED FOR A LOCAL WATCH
   EXTENSION.
   
   PRIMARY SEVERE CONVECTIVE LINE WITH HISTORY OF WIDESPREAD WIND
   DAMAGE/HAIL CONTINUES TO RACE SOUTHEASTWARD OFF THE WESTERN MAINE/NH
   COAST AT THIS TIME. FARTHER WEST...ANOTHER MODESTLY ORGANIZED TSTM
   CLUSTER CONTINUES TO ADVANCE EASTWARD ACROSS CENTRAL MA AS OF
   2315Z...AND A DOWNSTREAM WARM/MOIST BOUNDARY LAYER MAY SUPPORT A
   CONTINUED SEVERE RISK FROM CENTRAL INTO PORTIONS OF EASTERN MA OVER
   THE NEXT 1-2 HOURS. ALONG THE SURFACE FRONTAL ZONE...OTHER STRONG
   TSTMS HAVE SPREAD INTO NORTHERN NY OVER THE PAST HOUR. OVERALL...THE
   CONVECTIVELY OVERTURNED NATURE OF MUCH OF WW 698 AND A GRADUALLY
   COOLING/DECOUPLING BOUNDARY LAYER IS SUGGESTIVE OF A DECREASING
   SEVERE TSTM THREAT OVER THE NEXT FEW HOURS. NEVERTHELESS...SMALL
   PORTIONS OF WW 698 MAY WARRANT CONSIDERATION FOR TEMPORAL WATCH
   EXTENSION BEYOND 00Z.
   
   ..GUYER.. 07/18/2008
   
   
   ATTN...WFO...GYX...BOX...BTV...ALY...
   
   45107282 44837066 42957061 42047098 42107336 43567463
   44817490