DAY3SVR: Nws Storm Prediction Center Norman Ok

ACUS03 KWNS 170724
SWODY3
SPC AC 170722

DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0222 AM CDT WED OCT 17 2007

VALID 191200Z - 201200Z

..THERE IS A SLGT RISK OF SVR TSTMS ACROSS A LARGE PORTION OF THE
ERN CONUS...

..SYNOPSIS...
LARGE UPPER TROUGH CONTINUES EWD AND ASSOCIATED COLD FRONT
APPROACHES -- AND EVENTUALLY CLEARS -- THE ATLANTIC COAST.

..ERN UPPER GREAT LAKES AND THE W SLOPES OF THE APPALACHIANS EWD TO
THE ATLANTIC COAST...

ANOTHER DAY OF FAIRLY WIDESPREAD AND POTENTIALLY LOCALLY-SIGNIFICANT
SEVERE WEATHER IS ANTICIPATED AS COLD FRONT CONTINUES EWD ACROSS THE
APPALACHIANS/ATLANTIC COAST STATES. MOIST PRE-FRONTAL BOUNDARY
LAYER BUT LIMITED HEATING DUE TO ONGOING PRECIPITATION/CLOUD COVER
SUGGESTS MARGINAL DESTABILIZATION ACROSS THE RISK AREA. THIS SHOULD
SUSTAIN A LARGE PRE-FRONTAL BAND OF THUNDERSTORMS -- COMPRISED OF
SMALLER LINES/CLUSTERS -- FROM THE CANADIAN BORDER TO THE GULF OF
MEXICO.

WITH STRONG DEEP-LAYER WIND FIELD PERSISTING ACROSS THE WARM SECTOR
IN CONJUNCTION WITH THE UPPER TROUGH...SHEAR WILL ONCE AGAIN DRIVE
ORGANIZED/ROTATING STORMS. ALONG WITH STRONG/DAMAGING WINDS AND
HAIL...A FEW TORNADOES ARE ALSO EXPECTED -- PARTICULARLY ACROSS THE
NORTHEAST WHERE BACKED/SELY BOUNDARY-LAYER FLOW IS ANTICIPATED INVOF
A WARM FRONT SHIFTING NEWD ACROSS THIS REGION. STORMS/SEVERE THREAT
WILL LIKELY CONTINUE THROUGH THE OVERNIGHT HOURS...AS STORMS
NEAR/MOVE OFF THE ATLANTIC COAST.

.GOSS.. 10/17/2007

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