SWODY1
SPC AC 110556
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1156 PM CST SAT NOV 10 2007
VALID 111200Z - 121200Z
..NO SVR TSTM AREAS FORECAST...
..SYNOPSIS...
UPPER PATTERN IS FORECAST TO AMPLIFY WITH TIME ACROSS THE CONUS...AS
UPPER TROUGH INITIALLY NEAR THE W COAST AMPLIFIES AS IT CROSSES THE
INTERMOUNTAIN WEST. MEANWHILE...A LEAD WAVE IS EXPECTED TO MOVE
INTO THE SRN PLAINS DURING THE SECOND HALF OF THE PERIOD...WHILE
UPSTREAM RIDGING INCREASES AND SHIFTS ACROSS THE CENTRAL CONUS INTO
THE MIDWEST/MID SOUTH.
..MID MS/LOWER OH VALLEYS...
THUNDERSTORMS WILL LIKELY BE ONGOING AT THE START OF THE PERIOD
ACROSS PARTS OF THIS REGION...AND SHOULD CONTINUE/SPREAD EWD THROUGH
THE FIRST HALF OF THE PERIOD AS LOW-LEVEL WARM ADVECTION PERSISTS.
COVERAGE SHOULD DIMINISH DURING THE SECOND HALF OF THE PERIOD AS
LARGE-SCALE RIDGING INCREASES.
..SRN SIERRA...
MINIMAL INSTABILITY OVER THE HIGHER TERRAIN MAY SUPPORT THE
DEVELOPMENT OF SHOWERS AND ISOLATED THUNDERSTORMS DURING THE
AFTERNOON...AS MID-LEVEL TROUGH CROSSES THE AREA.
..RED RIVER VALLEY AND ADJACENT PORTIONS OF SRN OK/N TX...
UPPER SHORT-WAVE TROUGH IS FORECAST TO SHIFT INTO THE SRN PLAINS
DURING THE SECOND HALF OF THE PERIOD...WITH QG FORCING AND
MOISTENING NEAR 850 MB POSSIBLY SUFFICIENT TO ALLOW THE DEVELOPMENT
OF ISOLATED/ELEVATED STORMS BY THE END OF THE PERIOD.
.GOSS.. 11/11/2007
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