SWODY3
SPC AC 200749
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0149 AM CST FRI FEB 20 2009
VALID 221200Z - 231200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
UPPER AIR PATTERN WILL CONTINUE TO BE CHARACTERIZED BY MEAN
TROUGHING OVER ERN CONUS AND RIDGING IN W...WITH SEVERAL
SHORTWAVES/VORTICITY MAXIMA REINFORCING BROAD CYCLONIC GYRE OFFSHORE
PACIFIC COAST. STG SHORTWAVE TROUGH AND MID-UPPER LOW SHOULD MOVE
EWD FROM LH AREA ACROSS SRN ONT AND NRN NY. REINFORCING SHORTWAVE
TROUGH AND ATTENDANT SPEED MAX SHOULD PIVOT EWD FROM TN/KY ACROSS
AND OFFSHORE TIDEWATER REGION DURING FIRST 12 HOURS OF
PERIOD...BEFORE LIFTING NEWD AND MERGING WITH OR RE-FORMING PRIMARY
UPPER CYCLONE NEAR BAY OF FUNDY.
AT SFC...ASSOCIATED STG COLD FRONT DISCUSSED IN DAY-2 OUTLOOK WILL
PENETRATE SWD ACROSS FL PENINSULA AND AT LEAST NRN HALF OF GULF
DURING DAY-3...WHILE RACING OFFSHORE MID-ATLANTIC COAST S OF
DEEP/OCCLUDING CYCLONE THAT WILL MAKE LANDFALL ALONG MAINE OR NEW
BRUNSWICK COAST. CONVERGENCE AND INSTABILITY INVOF FL FRONTAL
SEGMENT EACH ARE EXPECTED TO BE TOO WEAK FOR SVR
POTENTIAL...PROBABLY EVEN INSUFFICIENT TO SUPPORT THUNDER.
..EDWARDS.. 02/20/2009
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