SWOD48
SPC AC 110816
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0216 AM CST THU DEC 11 2008
VALID 141200Z - 191200Z
...SVR POTENTIAL TOO LOW TO DELINEATE A SVR THREAT AREA...
MEDIUM RANGE FORECAST GUIDANCE INDICATES A PREVAILING LARGE-SCALE
UPPER PATTERN CHARACTERIZED BY A BROAD POSITIVELY TILTED TROUGH IN
THE WEST...AND STRONG CONFLUENT SOUTHWESTERLY FLOW THROUGH THE
REMAINDER OF THE NATION...BETWEEN A NORTH CENTRAL CANADIAN POLAR
VORTEX...AND A SEASONABLY STRONG RIDGE OVER THE SOUTHEASTERN GULF OF
MEXICO/WESTERN ATLANTIC. THIS IS EXPECTED TO GENERALLY SUPPORT COLD
SURFACE RIDGING ACROSS A LARGE PORTION OF THE INTERMOUNTAIN
WEST...AND MUCH OF THE CENTRAL U.S...EVEN AS A RETURN FLOW OF
MOISTURE OFF THE GULF OF MEXICO PERSISTS THROUGH MUCH OF THIS
PERIOD. AS IMPULSES EMERGE FROM THE WESTERN UPPER TROUGH... SURFACE
WAVE DEVELOPMENT ALONG THE LEADING EDGE OF THE SOUTHWARD ADVANCING
COLD AIR TO THE LEE OF THE SOUTHERN ROCKIES IS PROGGED TO REMAIN
WEAK...MINIMIZING SEVERE CONVECTIVE POTENTIAL THROUGH AT LEAST THE
MIDDLE OF NEXT WEEK.
..KERR.. 12/11/2008
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