SWODY2
SPC AC 041707
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1107 AM CST TUE DEC 04 2007
VALID 051200Z - 061200Z
..NO TSTM AREAS FORECAST...
..SYNOPSIS AND FORECAST...
A SLIGHT DE-AMPLIFICATION OF LONG WAVE PATTERN IS FORECAST DURING
THE DAY TWO PERIOD AS HEIGHTS REBOUND OVER THE ERN CONUS IN WAKE OF
STRONG SHORT WAVE TROUGH TRANSLATING SEWD FROM THE UPPER GREAT LAKES
TO OFF THE ATLANTIC COAST. IN THE W...SHORT WAVE TROUGH OVER THE
PACIFIC NW IS EXPECTED TO INTENSIFY THROUGH THE PERIOD WHILE
SHIFTING INTO THE NRN INTERMOUNTAIN REGION AND NRN PORTIONS OF THE
GREAT BASIN. IN THE LOW LEVELS...SURFACE LOW ATTENDANT TO ERN U.S.
SHORT WAVE TROUGH WILL QUICKLY DEVELOP EWD FROM THE LOWER OH VALLEY
TO OFF THE MIDDLE ATLANTIC COAST WITH TRAILING COLD FRONT PUSHING
SEWD THROUGH SERN QUARTER OF THE NATION.
COLD MID-LEVEL TEMPERATURES OF -26 TO -30 C WILL ACCOMPANY PACIFIC
NW SHORT WAVE TROUGH...CONTRIBUTING TO STEEPENING MID-LEVEL LAPSE
RATES AND POCKETS OF QUITE MARGINAL CONVECTIVE INSTABILITY OVER THE
NRN INTERMOUNTAIN REGION WEDNESDAY INTO WEDNESDAY NIGHT. ISOLATED
LIGHTNING STRIKES MAY ACCOMPANY THE DEEPER CONVECTIVE ELEMENTS
DEVELOPING WITHIN REGION OF FORCING FOR ASCENT AHEAD OF THIS TROUGH.
HOWEVER...THIS THREAT APPEARS TOO MARGINAL TO WARRANT INCLUSION OF A
THUNDER AREA.
.MEAD.. 12/04/2007
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