SWODY2
SPC AC 280527
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1127 PM CST TUE NOV 27 2007
VALID 291200Z - 301200Z
..NO TSTM AREAS FORECAST...
..SYNOPSIS AND FORECAST...
THE DAY TWO LARGE-SCALE PATTERN WILL BE CHARACTERIZED BY A
BROAD...CYCLONIC FLOW REGIME WITH AN EMBEDDED SHORT WAVE TROUGH
MOVING ACROSS THE ERN QUARTER OF THE NATION...AND AN AMPLIFYING
UPSTREAM SYSTEM DIGGING SWD ACROSS WRN CANADA INTO THE PACIFIC NW.
IN THE LOW LEVELS...COLD FRONT ASSOCIATED WITH THE ERN U.S. TROUGH
WILL QUICKLY PUSH EWD AND OFF THE ATLANTIC COAST BY THURSDAY
AFTERNOON OR EVENING. TRAILING PORTION OF BOUNDARY WILL MOVE MORE
SLOWLY SWD THROUGH THE FL PENINSULA. A SURFACE ANTICYCLONE WILL
FOLLOW THIS FRONT FROM THE SRN PLAINS TO E OF THE MS VALLEY WHILE
NEXT COLD FRONT SLOWLY SAGS SWD THROUGH THE NRN INTERMOUNTAIN W AND
NRN AND CNTRL PLAINS.
A MOIST BOUNDARY LAYER WILL PRECEED FRONT OVER FL WITH DEWPOINTS IN
THE 60S TO LOWER 70S. HOWEVER...WARM MID-LEVEL TEMPERATURES AND
RESULTANT POOR LAPSE RATES ARE EXPECTED TO LIMIT ANY DEEP CONVECTIVE
POTENTIAL ALONG AND AHEAD OF COLD FRONT. ELSEWHERE...RELATIVELY
COLD THERMODYNAMIC PROFILES ON CYCLONIC SIDE OF POLAR JET AXIS
DEVELOPING SWD THROUGH THE PACIFIC NW MAY SUPPORT A LIGHTNING STRIKE
OR TWO WITH ANY CONVECTIVE ELEMENTS MOVING ONSHORE THROUGH THE
PERIOD. THIS THREAT IS TOO MARGINAL TO WARRANT INCLUSION OF A
GENERAL THUNDER AREA.
.MEAD.. 11/28/2007
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