SWODY1
SPC AC 091941
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0241 PM CDT TUE OCT 09 2007
VALID 092000Z - 101200Z
..NO SVR TSTM AREAS FORECAST...
..CNTRL APPALACHIAN MTNS AND MID-ATLANTIC...
AN UPPER-LEVEL LOW NEAR LAKE SUPERIOR WILL MOVE SEWD ACROSS THE WRN
GREAT LAKES REGION THIS AFTERNOON CAUSING HEIGHTS TO SLOWLY FALL
ACROSS THE CNTRL APPALACHIANS. AT THE SFC...A COLD FRONT IS LOCATED
FROM WRN NY EXTENDING SWWD ACROSS NW PA INTO WRN WV. NUMEROUS
THUNDERSTORMS ARE DEVELOPING JUST AHEAD OF THE BOUNDARY AND
THUNDERSTORM COVERAGE MAY CONTINUE TO INCREASE FOR A FEW MORE HOURS
NEAR THE PEAK IN INSTABILITY. THE LATEST DIAGNOSTIC DATA SUGGESTS
MLCAPE VALUES ARE AROUND 1000 J/KG ACROSS CNTRL AND ERN PA WHERE SFC
DEWPOINTS ARE IN THE MID TO UPPER 60S F. LOW-LEVEL LAPSE RATES
LOCALLY EXCEED 7.5 C/KM AND THIS MAY SUPPORT AN ISOLATED WIND DAMAGE
THREAT WITH THE MORE INTENSE SHORT-LINE SEGMENTS. HOWEVER...
REGIONAL WSR-88D VWPS SHOWS VERTICAL SHEAR GENERALLY BELOW 20 KT
SUGGESTING THE WIND DAMAGE THREAT SHOULD BE BRIEF AND ISOLATED OVER
THE NEXT FEW HOURS.
.BROYLES.. 10/09/2007
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