SWODY2
SPC AC 290537
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1137 PM CST WED NOV 28 2007
VALID 301200Z - 011200Z
..NO SVR TSTM AREAS FORECAST...
..SYNOPSIS...
EVOLVING TROUGH OVER THE PACIFIC NW FRIDAY MORNING WILL AMPLIFY
THROUGH THE PERIOD IN RESPONSE TO DIGGING...MID AND UPPER-LEVEL JET
STREAKS OVER THE FAR ERN PACIFIC. AS THIS OCCURS...CUT-OFF LOW
SITUATED W OF BAJA CA WILL OPEN AND EJECT NEWD INTO THE FOUR CORNERS
REGION BY SATURDAY MORNING. AT THE SURFACE...BROAD LOW PRESSURE
OVER THE GREAT BASIN AND LOWER CO VALLEY WILL GRADUALLY CONSOLIDATE
INTO A SURFACE LOW WITH THIS FEATURE DEVELOPING NEWD INTO CNTRL
ROCKIES BY THE END OF THE PERIOD. FARTHER E...COLD FRONT INITIALLY
SAGGING SWD THROUGH THE SRN PLAINS WILL STALL AND THEN BEGIN TO
RETREAT NWD FRIDAY NIGHT IN RESPONSE TO INCREASING PRESSURE FALLS
AHEAD OF THIS DEVELOPING SURFACE LOW.
..AZ...
STRENGTHENING...SLY LOW-LEVEL FLOW AHEAD OF EJECTING CUT-OFF LOW AND
EVOLVING SURFACE CYCLONE WILL RESULT IN AN INCREASE IN MOISTURE NWD
THROUGH THE REGION...EFFECTIVELY CONTRIBUTING TO POCKETS OF MARGINAL
INSTABILITY FRIDAY NIGHT...NAMELY OVER CNTRL AND SRN PARTS OF THE
STATE. A FEW EMBEDDED TSTMS WILL BECOME INCREASINGLY LIKELY MAINLY
AFTER 01/06-01/09Z WITHIN ZONE OF STRONGER FORCING FOR ASCENT
IMMEDIATELY AHEAD OF UPPER WAVE. FORECAST SOUNDINGS INDICATE THAT
VERTICAL SHEAR WILL BE QUITE STRONG...HOWEVER THE MARGINAL
INSTABILITY SHOULD LIMIT UPDRAFT ORGANIZATION/LONGEVITY AND NO
SEVERE WEATHER IS EXPECTED.
.MEAD.. 11/29/2007
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