SPC AC 071217
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0617 AM CST SAT NOV 07 2009
VALID 071300Z - 081200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
SEVERAL S/W TROUGHS ARE FORECAST TO PIVOT EWD AROUND THE SRN
PERIPHERY OF AN UPPER LOW POSITIONED OVER THE GULF OF ALASKA. ONE
SUCH DISTURBANCE IS POISED TO ENTER THE PAC NW DURING THE MID TO
LATE AFTERNOON...AND WILL BE ACCOMPANIED BY COLD MID LEVEL AIR /AOB
-25 TO -30 DEG C AT 500 MB/. THIS WILL AID IN MAINTAINING FAVORABLY
STEEP LOW TO MID LEVEL LAPSE RATES AND SUFFICIENT MUCAPE /GIVEN
HUMID BOUNDARY LAYER AIRMASS/ FOR DEEP UPDRAFT
DEVELOPMENT/ISOLATED-SCATTERED LIGHTNING AS LOW TO MID LEVEL FLOW
FIELDS STRENGTHEN AND ENCOUNTER COASTAL MOUNTAINS. ELSEWHERE...MOIST
ELY LOW LEVEL FLOW WILL PERSIST ACROSS THE GULF OF MEXICO S OF AN
AXIS OF SURFACE HIGH PRESSURE. THIS MOISTURE IS FORECAST TO SURGE
INTO S CENTRAL TX LATE IN THE FORECAST PERIOD AHEAD OF A S/W TROUGH
MOVING E ACROSS NRN MEXICO. HOWEVER...THUNDERSTORM DEVELOPMENT IS
CURRENTLY EXPECTED TO HOLD OFF UNTIL AFTER 12Z/SUNDAY.
..GARNER/CORFIDI.. 11/07/2009
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1630Z
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