SWODY1
SPC AC 201236
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0636 AM CST FRI FEB 20 2009
VALID 201300Z - 211200Z
...NO TSTM AREAS FORECAST...
...SYNOPSIS...
DEEP UPPER CYCLONE IN NEW ENGLAND WILL BE EJECTED NEWD...AS A STRONG
SHORTWAVE DROPS SEWD FROM CANADA INTO THE NORTH CENTRAL CONUS...AND
CARVES OUT AN AMPLIFIED UPPER TROUGH OVER THE MID/UPPER MS VALLEY
REGION LATE FRIDAY. IN ASSOCIATION WITH THIS SYSTEM...A COLD FRONT
WILL PLUNGE SWD THROUGH THE PLAINS STATES AND EWD INTO THE MS
VALLEY. SLY WINDS ON THE BACKSIDE OF RETREATING SURFACE RIDGE WILL
RESULT IN RETURN OF MODIFIED GULF MOISTURE...DEWPOINTS IN THE 50S
AND LOWER 6OS...INTO SOUTH TEXAS LATE FRIDAY NIGHT. HOWEVER...
FORCING WILL BE WEAK AND WARM MID LEVEL TEMPERATURES SHOULD INHIBIT
THUNDERSTORM DEVELOPMENT THIS FORECAST PERIOD.
STRENGTHENING LOW LEVEL JET AND LARGE SCALE LIFT LIKELY WILL RESULT
IN CLOUDS/PCPN ACROSS PORTIONS OF THE MID MS VALLEY FRIDAY NIGHT...
BUT LACK OF INSTABILITY IS EXPECTED TO LIMIT ANY CONVECTIVE
DEVELOPMENT IN THIS REGION ALSO.
..EVANS/IMY.. 02/20/2009
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