SWODY1
SPC AC 071623
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1023 AM CST MON NOV 07 2011
VALID 071630Z - 081200Z
...THERE IS A SLGT RISK OF SVR TSTMS ACROSS PORTIONS OF THE
CNTRL/SRN PLAINS...
...CNTRL/SRN PLAINS...
CHANGES TO PREVIOUS OUTLOOK:
1/ EXPAND LOW TORNADO/SVR WIND PROBABILITIES NEWD INTO ERN KS.
2/ NARROW WIDTH OF SVR RISKS BY TRIMMING ON WRN/ERN FRINGES.
WATER VAPOR SHOWS THAT THE UPR LOW HAS TURNED E OVER AZ/NRN MEXICO
AND IS EXPECTED TO MIGRATE ENE INTO THE CNTRL/SRN PLAINS TONIGHT.
16Z SFC ANALYSIS PLACES A SFC LOW OVER THE WCNTRL TX WITH A FRONT
ENE INTO NWRN/NCNTRL OK AND SERN KS. CONSIDERABLE WARM/MOIST
ADVECTION WILL DRIVE WIDESPREAD CONVECTION/TSTMS POLEWARD OF THE
FRONT MUCH OF THE DAY. THIS MAY IMPEDE NWD TRANSLATION OF THE
FRONT...ESPECIALLY IN NCNTRL OK AND ERN KS. A NWWD MOVEMENT IS
EXPECTED...HOWEVER...OVER THE SERN TX PNHDL AND WCNTRL OK AS THE
AFOREMENTIONED SFC LOW DEVELOPS TOWARD SWRN OK LATER THIS AFTN.
LOW-LEVEL MOISTURE...CHARACTERIZED BY LWR-MID 60S SFC DEW
POINTS...HAVE BEEN TRANSPORTED NWWD TO THE FRONT. ALTHOUGH THERE
WILL BE LINGERING CONCERNS FOR MITIGATED DESTABILIZATION FROM NCNTRL
OK INTO KS OWING TO CLOUDS/PCPN THIS AFTN...LATE MORNING VISIBLE
IMAGERY SHOWS CLEARING MOVING INTO W TX AND SWRN OK.
HERE...STRONGEST DESTABILIZATION WILL OCCUR WITH MLCAPES TO
2000-2500 J/KG BY LATE AFTN. FARTHER NE...500-1500 J/KG MLCAPES ARE
EXPECTED.
AS INCREASING ASCENT/ENHANCED MOISTENING/COOLING OF THE COLUMN
COMMENCES WITH APPROACH OF THE UPR TROUGH...WDLY SCTD TSTMS WILL
FORM NEAR A TRIPLE POINT/N EDGE OF STEEP LLVL LAPSE RATES ALONG THE
TX PNHDL/WRN OK BORDER SWWD INTO THE SERN ROLLING PLAINS OF TX IN
THE 22-23Z TIME FRAME. DEEP-LAYER SHEAR OF 50-55 KTS AND MAGNITUDE
OF MID-LVL LAPSE RATES SUGGEST SUPERCELL STORM MODE WILL BE LIKELY
WITH VERY LARGE HAIL. 0-1KM SRH VALUES WILL BE SUBSTANTIAL...250+
M2/S2...AND TORNADOES WILL BE POSSIBLE WITH INITIAL
ACTIVITY...ESPECIALLY FROM THE ERN TX PNHDL/SE ROLLING PLAINS INTO
SWRN/WCNTRL OK /00-03Z/.
ACTIVITY WILL EXPAND...BOTH NE AND SW INTO ERN KS AND NW/WCNTRL TX
LATER THIS EVENING. INCREASING SLAB ASCENT SUGGESTS THAT A
TRANSITION CHIEFLY INTO A LINEAR MODE WITH EMBEDDED ROTATING CELLS
WILL TAKE PLACE OVERNIGHT AS ACTIVITY PROGRESSES INTO ERN KS...CNTRL
OK AND CNTRL/NCNTRL TX. DMGG WIND GUSTS...LARGE HAIL AND ISOLD
TORNADOES WILL BE POSSIBLE MOST OF THE NIGHT.
..RACY/GARNER.. 11/07/2011
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