DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 081718
SWODY2
SPC AC 081716

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1216 PM CDT MON OCT 08 2007

VALID 091200Z - 101200Z

..NO SVR TSTM AREAS FORECAST...

..CNTRL APPALACHIAN MTNS...
AN UPPER-LEVEL LOW OVER WRN ONTARIO TONIGHT IS FORECAST TO DRIFT
ESEWD INTO THE WRN GREAT LAKES REGION TUESDAY. AT THE SFC...A COLD
FRONT WILL MOVE SEWD INTO THE CNTRL APPALACHIAN MTNS. SFC HEATING
AND LOW-LEVEL CONVERGENCE ALONG THE BOUNDARY SHOULD RESULT IN THE
DEVELOPMENT OF SCATTERED TO NUMEROUS THUNDERSTORMS AROUND MIDDAY
TUESDAY FROM SRN NY SWWD ACROSS PA...WV INTO THE TN VALLEY. ALTHOUGH
INSTABILITY WILL LIKELY REMAIN RELATIVELY WEAK...VERTICAL SHEAR
SHOWN ON FORECAST SOUNDINGS SHOULD BE ADEQUATE FOR A MARGINAL SEVERE
THREAT. THE AREA WITH THE GREATEST POTENTIAL MAY BE ACROSS NCNTRL
AND ERN PA WHERE A SFC LOW IS FORECAST TO ORGANIZE AND VERTICAL
SHEAR MAY BE SLIGHTLY ENHANCED. LOW-LEVEL LAPSE RATES MAY BECOME
STEEP ENOUGH COMBINED WITH UNIDIRECTIONAL BOUNDARY LAYER FLOW FOR A
ISOLATED WIND DAMAGE THREAT ESPECIALLY WITH THE FASTER MOVING LINE
SEGMENTS.

.BROYLES.. 10/08/2007

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