NWS STORM PREDICTION CENTER NORMAN OK
0639 PM CST FRI MAR 09 2012
VALID 100100Z - 101200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
A CUT-OFF UPPER LOW NOW OVER SERN AZ WILL CONTINUE A VERY SLOW SWWD
RETROGRADE THIS PERIOD...WHILE FASTER/MORE PROGRESSIVE FLOW ALOFT
PERSISTS ACROSS THE NRN U.S. AND CANADA.
AS A LARGE TROUGH WITHIN THIS FASTER WLY FLOW ALOFT SHIFTS ACROSS
ERN NOAM...AN ASSOCIATED SURFACE COLD FRONT -- EXTENDING FROM THE
WRN ATLANTIC SWWD ACROSS NRN FL AND INTO THE GULF OF MEXICO -- WILL
CONTINUE TO FOCUS SHOWERS AND A FEW THUNDERSTORMS THIS PERIOD.
SHOWERS AND ELEVATED STORMS WILL ALSO PERSIST ACROSS TX AND PARTS OF
LA...WITHIN A ZONE OF LOW-LEVEL WARM ADVECTION ATOP THE COOL
POST-FRONTAL BOUNDARY LAYER. HOWEVER...WITH MODEST INSTABILITY
ACROSS THESE AREAS...STORMS ARE FORECAST TO REMAIN SUB-SEVERE
THROUGH THE PERIOD.
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