SWODY1
SPC AC 200533
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1133 PM CST SAT JAN 19 2008
VALID 201200Z - 211200Z
..NO SVR TSTM AREAS FORECAST...
..SYNOPSIS...
UPPER FLOW PATTERN IS EXPECTED TO BECOME ZONAL DURING THE DAY 1
FORECAST PERIOD AS AN UPPER LOW/TROUGH MOVES SWD ACROSS THE WRN
STATES. THIS WILL ALLOW A DOWNSTREAM SHORTWAVE TROUGH TO TRACK
QUICKLY ENEWD AWAY FROM THE MIDDLE/SRN ATLANTIC STATES. SRN EXTENT
OF A COLD FRONT ATTENDANT TO THIS ERN U.S. TROUGH SHOULD RESIDE
ACROSS THE FAR SRN TIP OF FL AT 12Z TODAY. A MOIST/MARGINALLY
UNSTABLE AIR MASS S OF THE FRONT...AND ESPECIALLY OVER THE WATERS S
OF FL WHERE SENSIBLE HEAT/MOIST FLUXES WILL BE GREATER...IS EXPECTED
TO SUPPORT TSTMS AS THE FRONT MOVES SWD. TSTM THREAT SHOULD END
OVER LAND BY 15Z AS THE FRONT MOVES AWAY FROM THE MAINLAND INTO THE
FL STRAITS.
ELSEWHERE ACROSS THE CONUS...A LARGE SURFACE HIGH WILL BUILD E OF
THE MS RIVER VALLEY WITH A COLD/DRY AND STABLE AIR MASS PRECLUDING
TSTM DEVELOPMENT.
.PETERS.. 01/20/2008
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