SPC AC 240509
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1109 PM CST SUN DEC 23 2007
VALID 241200Z - 251200Z
...NO TSTM AREAS FORECAST...
...SYNOPSIS AND FORECAST...
A PROGRESSIVE LARGE-SCALE PATTERN WILL CONTINUE THROUGH THE DAY ONE
PERIOD...FEATURING A SERIES OF MIDLEVEL TROUGHS FROM THE CNTRL
PACIFIC EWD ACROSS THE CONUS. THE MOST NOTABLE FEATURE WILL BE
SHORT WAVE TROUGH WHICH WILL AMPLIFY WHILE TRANSLATING EWD/SEWD FROM
THE PACIFIC NW INTO THE CNTRL PART OF THE NATION. IN THE LOW
LEVELS...SURFACE RIDGE AXIS WILL PERSIST FROM THE CNTRL ATLANTIC
COAST SWWD INTO THE SRN PLAINS...RESULTING IN OFFSHORE FLOW ACROSS
THE GULF OF MEXICO BASIN.
COLD MIDLEVEL TEMPERATURES OF -30 TO -34 C AT 500 MB WILL ACCOMPANY
ABOVEMENTIONED SHORT WAVE TROUGH...CONTRIBUTING TO STEEPENING LAPSE
RATES AND POCKETS OF WEAK CONVECTIVE INSTABILITY IN THE WAKE OF
SURFACE COLD FRONT. A FEW ISOLATED LIGHTNING STRIKES WILL BE
POSSIBLE OVER THE PACIFIC NW THIS MORNING INTO PARTS OF THE
NRN/CNTRL ROCKIES LATER TODAY. THIS POTENTIAL APPEARS QUITE
MARGINAL AND NO THUNDER AREA WILL BE INCLUDED.
..MEAD.. 12/24/2007
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1300Z
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