DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 191724
SWODY2
SPC AC 191722

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1122 AM CST MON NOV 19 2012

VALID 201200Z - 211200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...

UPPER TROUGH NOW OVER THE CNTRL U.S. IS FORECAST TO AMPLIFY AS IT
CONTINUES INTO THE ERN STATES...WHILE A NRN STREAM SHORTWAVE TROUGH
MOVES INTO THE PACIFIC NW. A SRN STREAM TROUGH WEST OF BAJA WILL
CONTINUE EWD THROUGH NRN MEXICO TUESDAY NIGHT.

...PACIFIC NW...

STEEPENING LAPSE RATES IN POST FRONTAL REGIME RESULTING FROM COLD
TEMPERATURES ALOFT ACCOMPANYING THE PROGRESSIVE UPPER TROUGH WILL
RESULT IN WEAK INSTABILITY ALONG THE COASTAL PACIFIC NW. AREAS OF
SHOWERS AND POSSIBLY A FEW THUNDERSTORMS WILL LIKELY DEVELOP WITHIN
THIS REGIME.

...SERN AZ...SRN NM AND FAR W TX...

LAPSE RATES WILL STEEPEN OVER SRN PORTIONS OF THE SWRN STATES WITH
APPROACH OF SRN STREAM SHORTWAVE TROUGH. MID LEVEL ASCENT RESULTING
FROM THIS FEATURE AND STEEPENING LAPSE RATES WILL CONTRIBUTE TO
MARGINAL INSTABILITY AND AT LEAST A MODEST POTENTIAL FOR ISOLATED TO
WIDELY SCATTERED ELEVATED CONVECTION TUESDAY NIGHT LIKELY BASED NEAR
700 MB.

..DIAL.. 11/19/2012

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