SWODY1
SPC AC 071238
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0638 AM CST FRI DEC 07 2007
VALID 071300Z - 081200Z
..NO SVR TSTM AREAS FORECAST...
..SYNOPSIS...
WELL-DEFINED VORT MAX OVER CNTRL CA WILL CONTINUE ESE ACROSS CNTRL
/SRN CA TODAY BEFORE WEAKENING AS IT CROSSES THE SIERRA AND HEADS
ENE ACROSS SRN NV/SRN UT LATER TODAY/TONIGHT. LARGER SCALE TROUGH
WILL...HOWEVER...BE MAINTAINED OVER CNTRL/SRN CA THROUGH 12Z
SATURDAY AS ADDITIONAL SPEED MAXIMA NOW OFF THE WA/ORE COAST
CONTINUE SSEWD.
AT LWR LVLS...DEEP COLD FRONTAL ZONE WITH CA SYSTEM WILL CONTINUE SE
ACROSS THE SRN PART OF THE STATE...REACHING THE LWR CO VLY BY EARLY
AFTN. IN ITS WAKE...SOMEWHAT DRIER AIR WILL OVERSPREAD REGION.
FARTHER E...SHALLOWER BOUNDARY EXPECTED TO BECOME BETTER DEFINED
TODAY/TONIGHT FROM THE TX PANHANDLE ESE ACROSS THE RED RVR VLY INTO
CNTRL AR AS COLD SFC RIDGE BUILDS SE ACROSS THE NRN PLNS/UPR MS VLY.
VEERED NATURE OF 850/700 MB FLOW ACROSS TX AND PRESENCE OF SRN
STREAM DISTURBANCE OVER THE NWRN GULF WILL MINIMIZE MOISTURE RETURN
INVOF THE FRONT THROUGH THE PERIOD.
..CA SIERRA INTO SRN GRT BASIN...
ONGOING CLUSTER OF TSTMS OVER THE CNTRL CA SIERRA APPEARS TO BE
SUPPORTED BY UPSLOPE FLOW...FRONTAL ASCENT AND UVV IN EXIT REGION OF
100 KT MID LVL SPEED MAX ASSOCIATED WITH PREVIOUSLY-MENTIONED UPR
VORT. EXPECT THIS ACTIVITY TO WEAKEN LATER THIS MORNING AS JET
STREAK REFORMS E OF THE SIERRA AND LOW LVL COLD FRONT CONTINUES SE
AWAY FROM REGION OF STRONGEST ASCENT/COOLING ALOFT.
E AND SE OF THE SIERRA...POTENTIAL WILL EXIST FOR DIURNALLY-ENHANCED
CONVECTION/POSSIBLE THUNDER LATER TODAY INTO TONIGHT AS VORT MAX
CONTINUES EWD. MOISTURE WILL BE LIMITED. BUT IT WILL BE SUFFICIENT
FOR SCTD DEEP CONVECTION...AND POSSIBLY OCCASIONAL AREAS OF
THUNDER...GIVEN COMBINATION OF STEEPENING MID-LEVEL LAPSE RATES
/TOTAL-TOTAL INDEX AOA 50/...OROGRAPHIC UPLIFT...AND CLOUD TOP TEMPS
BLO MINUS 20C.
.CORFIDI.. 12/07/2007
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