[SWODY1] SWODY1

[Severe Weather Outlook Day 1]

ACUS01 KWNS 211244
SWODY1
SPC AC 211241

DAY 1 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK
0641 AM CST TUE NOV 21 2006

VALID 211300Z - 221200Z

...NO SVR TSTM AREAS FORECAST...

...PAC NW COAST INTO THE NRN SIERRAS AND NRN ROCKIES...
12Z SOUNDINGS AND EARLY MORNING LIGHTNING DETECTION NETWORK INDICATE
ISOLATED THUNDERSTORMS WILL LIKELY CONTINUE THIS MORNING ALONG THE
PAC NW COAST AND WITHIN BROAD MID LEVEL MOISTURE PLUME INTO THE NRN
SIERRAS.  STRONG MID/UPPER LEVEL TROUGH WILL PERSIST ALONG AND JUST
OFF THE PAC NW COAST THROUGH THE PERIOD WITH SHORTWAVE TROUGH NOW
APPROACHING THE COAST LIFTING ENEWD INTO THE NRN ROCKIES AS ANOTHER
VORT MAX DIGS SSEWD OUT OF THE GULF OF AK.  PERSISTENT ONSHORE FLOW
AND STEEP LOW TO MID LEVEL LAPSE RATES SHOULD MAINTAIN ISOLATED
THUNDERSTORMS ALONG AND WEST OF THE COASTAL RANGE IN WRN WA/ORE. 
ELSEWHERE...MOIST CONVECTION AND POSSIBLY ISOLATED THUNDERSTORMS
SHOULD DEVELOP ALONG AND AHEAD OF SHORTWAVE TROUGH AND ASSOCIATED
PAC COLD FRONT FORECAST TO OVERSPREAD THE NRN ROCKIES LATER TODAY
AND TONIGHT.

...SERN U.S. COAST...
INTENSE LOW SYSTEM WILL REMAIN IN PLACE JUST OFF THE GA/FL/SC COAST
THROUGH THE PERIOD.  DEEPER CONVERGENCE AND GREATER INSTABILITY WILL
REMAIN OVER THE GULF STREAM AND SUPPORT SCATTERED THUNDERSTORMS JUST
OFF THE COAST. HOWEVER...SUFFICIENT MID LEVEL COOLING IS EXPECTED
TO SUSTAIN NARROW WEDGE OF ELEVATED INSTABILITY AND POTENTIAL FOR AN
ISOLATED THUNDERSTORM OR TWO ACROSS COASTAL SC INTO ERN NC TODAY AND
TONIGHT.

..EVANS.. 11/21/2006