SWODY2
SPC AC 120552
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1152 PM CST WED NOV 11 2009
VALID 131200Z - 141200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
CLOSED UPPER LOW WILL CONTINUE TO DRIFT SLOWLY EWD AWAY FROM THE NC
COAST. FARTHER W...A SERIES OF SHORTWAVE TROUGHS WILL MOVE THROUGH
THE BROADER UPPER TROUGH. THIS INCLUDES A NRN STREAM IMPULSE THAT
WILL MOVE FROM THE NRN/CNTRL ROCKIES INTO THE NRN/CNTRL PLAINS
FOLLOWED CLOSELY BY A SHORTWAVE TROUGH THAT WILL MOVE INTO THE
PACIFIC NW. A SRN BRANCH SHORTWAVE TROUGH WILL MOVE THROUGH THE
GREAT BASIN AND INTO THE CNTRL/SRN ROCKIES.
AT THE SURFACE A COLD FRONT WILL ACCOMPANY THE UPPER TROUGH AND WILL
EXTEND FROM THE UPPER MS VALLEY SWWD INTO THE GREAT BASIN EARLY
FRIDAY. THIS BOUNDARY WILL ADVANCE SEWD AND STRETCH FROM THE GREAT
LAKES SWWD INTO THE SRN ROCKIES BY THE END OF THE PERIOD.
...NRN AZ THROUGH CNTRL ROCKIES AND CNTRL PLAINS...
MOISTURE WILL REMAIN LIMITED AHEAD OF SEWD ADVANCING COLD FRONT.
HOWEVER...FORCING FOR ASCENT ALONG BAROCLINIC ZONE WITHIN A
MODERATELY STEEP LAPSE RATE ENVIRONMENT WILL CONTRIBUTE TO MARGINAL
INSTABILITY AND SCATTERED SHOWERS. A FEW THUNDERSTORMS WILL BE
POSSIBLE WITH CONVECTION THAT DEVELOPS. HOWEVER...ANY LIGHTNING
ACTIVITY WILL LIKELY REMAIN SPARSE DUE TO THE LIMITED INSTABILITY.
...PACIFIC NW COASTAL AREA...
ASCENT AND STEEP MID LEVEL LAPSE RATES ASSOCIATED WITH A SHORTWAVE
TROUGH MOVING INTO THE PACIFIC NW WILL CONTRIBUTE TO WEAK
INSTABILITY AND SCATTERED CONVECTION WITH POTENTIAL FOR ISOLATED
LIGHTNING ACTIVITY DURING THE DAY.
..DIAL.. 11/12/2009
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