DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 271718
SWODY2
SPC AC 271718

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1218 PM CDT MON SEP 27 2010

VALID 281200Z - 291200Z

...THERE IS A SLGT RISK OF SVR TSTMS ACROSS SRN NEW ENGLAND AND THE
MID-ATLANTIC COAST...

...SYNOPSIS...
A LARGE UPPER LOW/TROUGH CENTERED OVER THE OH/TN VALLEY REGION AT
THE START OF THE PERIOD IS PROGGED TO WEAKEN WITH TIME...AS ONE
PIECE OF SHORT-WAVE ENERGY SHIFTS NEWD ACROSS THE LOWER GREAT LAKES
REGION AND A SECOND DIGS SEWD ACROSS THE TN VALLEY INTO THE
SOUTHEAST.

AT THE SURFACE...LOW PRESSURE IS FORECAST TO WEAKEN WITH TIME WHILE
SHIFTING NEWD ACROSS THE LOWER GREAT LAKES INTO SRN QUEBEC LATE.
THE TRAILING COLD FRONT WILL ALSO WEAKEN WITH TIME...AS IT MOVES
TOWARD/OFF THE ATLANTIC COAST THROUGH THE END OF THE PERIOD.

...SRN NEW ENGLAND SWD TO THE MID-ATLANTIC COAST...
WIDESPREAD PRECIPITATION WITH EMBEDDED THUNDERSTORMS WILL BE ONGOING
AT THE START OF THE PERIOD FROM THE MID-ATLANTIC COASTAL REGION NWD
INTO PA/NY AND SRN NEW ENGLAND...AS THE SURFACE LOW DRIFTS NEWD
ACROSS THE LOWER GREAT LAKES REGION AND THE TRAILING COLD FRONT
MOVES SLOWLY EWD TOWARD THE ATLANTIC COAST.

THE WARM SECTOR IS PROGGED TO LINGER ONSHORE ACROSS THE MID-ATLANTIC
REGION AND SRN NEW ENGLAND INTO THE AFTERNOON. DESPITE THE VERY
MOIST BOUNDARY LAYER HOWEVER...ONLY MEAGER INSTABILITY IS EXPECTED.
STILL...THE AIRMASS SHOULD REMAIN SUFFICIENT FOR A CONTINUATION OF
ISOLATED STORMS EMBEDDED WITHIN THE LARGER AREA OF RAIN/RAIN
SHOWERS.

WHILE THE LACK OF MORE APPRECIABLE INSTABILITY WILL ACT TO SUPPRESS
SEVERE THREAT...VERY STRONG FLOW ALOFT IS PROGGED ACROSS THE REGION
AS THE STORM SYSTEM SHIFTS NNEWD WITH TIME. WHILE FLOW WILL REMAIN
GENERALLY UNIDIRECTIONAL THROUGH A DEEP LAYER...DEGREE OF SPEED
SHEAR WILL BE MORE THAN SUFFICIENT TO SUPPORT ORGANIZATION WITHIN
ANY SUSTAINED UPDRAFT. THEREFORE...WILL MAINTAIN SLIGHT RISK ACROSS
THIS REGION...WITH POTENTIAL FOR A FEW LOCALLY-DAMAGING GUSTS AND/OR
AN ISOLATED/BRIEF TORNADO OR TWO.

..GOSS.. 09/27/2010

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