SWODY2
SPC AC 271728
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1128 AM CST TUE NOV 27 2007
VALID 281200Z - 291200Z
..NO TSTM AREAS FORECAST...
..SYNOPSIS...
A PROGRESSIVE NRN STREAM WILL PERSIST INTO WEDNESDAY. THE UPR
TROUGH NOW CROSSING THE NRN ROCKIES/GRT BASIN TODAY WILL QUICKLY
MOVE TO THE LWR GRTLKS AND OH VLY REGIONS THROUGH THE DAY WEDNESDAY.
A SEPARATE IMPULSE EMBEDDED WITHIN THE SRN POLAR BRANCH OVER THE
SRN PLAINS WILL QUICKLY TRANSLATE OFF THE SERN COAST BY WEDNESDAY
AFTN. MEANWHILE...ANOTHER MID-LEVEL WAVE WILL DIG SEWD INTO THE PAC
NW COAST REGION BY LATE IN THE PERIOD.
IN THE LOW LEVELS...SURFACE LOW ATTENDANT TO LEAD UPPER
TROUGH WILL UNDERGO OCCLUSION WHILE DEVELOPING NEWD FROM THE UPPER
MS VALLEY INTO ERN ONTARIO. TRAILING COLD FRONT WILL PUSH EWD
THROUGH THE GREAT LAKES AND MORE SEWD THROUGH THE SRN PLAINS AND
MIDDLE/LOWER MS VALLEY. TSTM PROBABILITIES ACROSS THE CONUS WILL
REMAIN MINIMAL DURING THE DAY 2 PERIOD.
..SRN FL PENINSULA...
FRONT SETTLING SWD INTO CNTRL FL TODAY WILL EVENTUALLY LOSE
CHARACTER BY EARLY WEDNESDAY. AS A RESULT...LOW-LEVEL WIND FIELDS
WILL VEER WITH TIME AND SUPPORT A GRADUAL MOISTENING OF THE BOUNDARY
LAYER. ISOLD SHOWERS MAY FORM...ESPECIALLY ACROSS ERN PORTIONS OF
CNTRL/SRN FL...DURING PEAK HEATING. BUT...FCST SOUNDINGS EXHIBIT
POOR LAPSE RATES...PARTICULARLY ABOVE H7. THEREFORE...IT IS NOT
LIKELY THAT TSTMS WILL RESULT AND THE PREVIOUS GENERAL TSTM OTLK HAS
BEEN REMOVED.
..PAC NW...
A FEW LIGHTNING STRIKES WILL BE POSSIBLE WITH ANY CONVECTIVE
ELEMENTS MOVING ONTO THE PACIFIC NW COAST IN ASSOCIATION
WITH THE COLD UPPER TROUGH. THIS POTENTIAL APPEARS QUITE MARGINAL
AND NO THUNDER AREA WILL BE DELINEATED.
.RACY.. 11/27/2007
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