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Monday, July 25, 2011

Mesoscale Discussion #1730 (Outlook Upgrade, Severe T-Storm Watch)


AREAS FROM NERN OH ACROSS WRN NY AND NY SRN TIER TO THE MOHAWK
VALLEY...AS WELL AS NWRN PA...WILL BE INCLUDED IN A SLGT RISK AREA
WITH THE ISSUANCE OF THE NEXT SPC DAY 1 OTLK BY 1630 UTC/1230 EDT.
FURTHERMORE...A WATCH MAY BE NEEDED ACROSS SOME OF THIS AREA BEFORE
NOON EDT.

VSBL SATL IMAGERY DEPICTS AN AXIS OF RELATIVELY CLEAR SKIES FROM OH
ENEWD ACROSS THE SRN TIER OF NY. EXPECT THAT SURFACE HEATING ACROSS
THIS CORRIDOR...ALONG WITH INCREASINGLY FAVORABLE LARGE SCALE ASCENT
ASSOCIATED WITH AN APPROACHING UPPER TROUGH...WILL SUPPORT THE
CONTINUED DEVELOPMENT OF SEVERE TSTMS INTO THE AFTERNOON. COINCIDENT
WITH THE INCREASE IN INSTABILITY WITHIN THE VERY MOIST AND WARMING
AIRMASS...DEEP LAYER SHEAR WILL BECOME INCREASINGLY STRONG AS
40-50KT MID-LEVEL SPEED MAX SPREADS EAST FROM THE UPPER GREAT LAKES.
THIS WILL PROMOTE LONGER-LIVED/ORGANIZED UPDRAFTS LIKELY TAKING THE
FORM OF LINE/BOWING SEGMENTS CAPABLE OF PRODUCING DAMAGING WINDS AS
WELL AS SOME HAIL.

IF LATEST TRENDS WITH THE BROKEN PRE-FRONTAL LINE OF STORMS NOW
MOVING INTO WRN NY CONTINUE...A SVR TSTM WATCH WILL ALSO BE
COORDINATED SHORTLY FOR PARTS OF THE REGION.

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