SWOMCD
SPC MCD 251951
NYZ000-PAZ000-252045-
MESOSCALE DISCUSSION 1318
NWS STORM PREDICTION CENTER NORMAN OK
0251 PM CDT THU JUN 25 2009
AREAS AFFECTED...NY...NRN PA
CONCERNING...SEVERE THUNDERSTORM WATCH 508...
VALID 251951Z - 252045Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 508
CONTINUES.
SLOWLY EXPANDING...BUT WEAKENING MCS IS GRADUALLY MOVING ACROSS
WW508. AIRMASS REMAINS QUITE UNSTABLE ACROSS THE FINGER LAKES
REGION WHERE MLCAPE VALUES REMAIN ON THE ORDER OF 2000 J/KG...THOUGH
INSTABILITY IS MUCH WEAKER FARTHER SOUTH OVER NRN PA. GREATEST
THREAT FOR SEVERE OVER THE NEXT FEW HOURS WILL BE WITH LEADING
ACTIVITY AS IT MOVES ACROSS STEUBEN/YATES/SENECA/CAYUGA COUNTIES IN
UPSTATE NY.
A LOCAL EXTENSION MAY BE REQUIRED EAST OF WW TO ACCOUNT FOR SEVERE
THREAT SPREADING DOWNSTREAM.
..DARROW.. 06/25/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BGM...BUF...CTP...
LAT...LON 42327948 42697772 44077548 42607526 41607687 41647947
42327948
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