SWODY3
SPC AC 040744
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0144 AM CST FRI DEC 04 2009
VALID 061200Z - 071200Z
...SYNOPSIS...
THE BLOCKING PATTERN DEVELOPING SATURDAY ACROSS THE CENTRAL AND
EASTERN PACIFIC INTO WESTERN NORTH AMERICA IS EXPECTED TO CHANGE
LITTLE THROUGH SUNDAY. BROADLY CYCLONIC WEST SOUTHWESTERLY MID/
UPPER FLOW IS EXPECTED TO PERSIST THROUGH THE PERIOD...SOUTH OF A
DEVELOPING CLOSED LOW...OVER THE NORTHWESTERN STATES...THROUGH THE
ATLANTIC SEABOARD. WITHIN THIS REGIME...MODELS INDICATE AT LEAST A
COUPLE OF PERTURBATIONS WILL LIFT NORTHEAST OF THE CENTRAL/ SOUTHERN
ROCKIES AND NORTHERN MEXICAN PLATEAU REGION...ACCOMPANIED BY A
RETURN TO SOUTHERLY FLOW OFF THE GULF OF MEXICO INTO PARTS OF THE
SOUTH CENTRAL AND SOUTHEASTERN STATES. HOWEVER...IN THE WAKE OF THE
SIGNIFICANT PRIOR COLD INTRUSION...GUIDANCE IS GENERALLY INDICATIVE
THAT BOUNDARY LAYER MODIFICATION OVER THE GULF OF MEXICO WILL NOT BE
SUPPORTIVE OF A SUBSTANTIVE RETURN FLOW OF MOISTURE. POTENTIAL FOR
BOUNDARY LAYER DESTABILIZATION OVER COASTAL WATERS AND INLAND OF
COASTAL AREAS APPEARS LOW TO NEGLIGIBLE SUNDAY/SUNDAY NIGHT...LIKELY
PRECLUDING THE RISK FOR SEVERE STORMS.
..KERR.. 12/04/2009
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