SWOMCD
SPC MCD 290023
TXZ000-290300-
MESOSCALE DISCUSSION 0621
NWS STORM PREDICTION CENTER NORMAN OK
0723 PM CDT TUE APR 28 2009
AREAS AFFECTED...PORTIONS W-CENTRAL-NW TX...PANHANDLE THROUGH
SOUTH-PLAINS...LOW ROLLING PLAINS AND PERMIAN BASIN REGIONS.
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 290023Z - 290300Z
WW MAY BE REQUIRED FOR PORTIONS OF THIS REGION ANY TIME THROUGH LATE
EVENING. SVR POTENTIAL SHOULD INCREASE THROUGH REMAINDER LATE
AFTERNOON/EVENING ACROSS AREAS E OF WW 205...AND IN SOMEWHAT
SEPARATE REGIME FROM THAT PRIMARILY DRIVING THAT WW.
SFC MESOANALYSIS SHOWS VERY DIFFUSE WARM FRONTAL ZONE FROM LOWEST
PORTION PECOS VALLEY ENEWD OVER EDWARDS PLATEAU AND SRN HILL COUNTRY
-- BETWEEN JCT-SJT AND N OF AUS -- THEN EWD TO AREAS BETWEEN
CLL-TPL. THIS FRONT SHOULD LIFT NWD ERRATICALLY THROUGH
EVENING...BENEATH BROAD AND INCREASINGLY MOIST SELY LLJ. PRIND LLJ
WILL STRENGTHEN TO 35-45 KT RANGE AFTER ABOUT 02Z AND VEER
SOMEWHAT...WITH STG/ELEVATED WAA AND MOISTURE TRANSPORT OVER
DISCUSSION AREA. THIS PROCESS SHOULD BOOST BOTH LOW LEVEL THETAE
AND LOW-MIDLEVEL LAPSE RATES...INCREASING MUCAPE FROM ROUGHLY 1000
J/KG OVER PANHANDLE AND SOUTH-PLAINS REGION TO NEAR 2000 J/KG WHILE
MAINTAINING AT LEAST 2000 J/KG MUCAPE SWD INTO PORTIONS CONCHO
VALLEY AND LOW ROLLING PLAINS. EVEN AFTER ADJUSTING FOR APPARENT
THERMAL SENSOR ERROR IN LOW LEVELS OF MAF RAOB THAT ARTIFICIALLY
BOOSTS BUOYANCY...MAF RAOB STILL SHOWS ML/MUCAPE IN 2000-2500 RANGE.
CONDITIONAL/SFC-BASED SUPERCELL POTENTIAL EXISTS ACROSS LATTER AREAS
BEFORE DUSK. ALTHOUGH LOW LEVEL CONVERGENCE APPEARS WEAK...SO IS
SBCINH...AND ANY TSTMS THAT CAN DEVELOP AND STAY ROOTED WITHIN WARM
FRONTAL ZONE BEFORE DARK MAY EVOLVE INTO SFC-BASED SUPERCELLS. MORE
PROBABLE SCENARIO IS FOR GRADUAL INCREASE IN TSTMS ELEVATED ABOVE
RELATIVELY COOL/STABLE LAYER FATHER NW ON EITHER SIDE OF CAPROCK
INTO PANHANDLE. PROFILER DATA AND MODIFIED RUC SOUNDINGS SUGGEST
EFFECTIVE SHEAR MAGNITUDES APCHG 50 KT FOR ANY SUCH
ACTIVITY...SUPPORTING ROTATION ALOFT AND THREAT FOR LARGE HAIL.
..EDWARDS.. 04/29/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OUN...SJT...LUB...AMA...MAF...
LAT...LON 30660172 31070211 31330272 32080272 32070305 35720297
36420203 36080045 34710030 33559987 32329932 31099890
30660172
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