SWOMCD
SPC MCD 240005
OKZ000-KSZ000-TXZ000-240200-
MESOSCALE DISCUSSION 0549
NWS STORM PREDICTION CENTER NORMAN OK
0705 PM CDT MON APR 23 2007
AREAS AFFECTED...PORTIONS TX/OK PANHANDLES...WRN OK...W-CENTRAL/SW
TX.
CONCERNING...TORNADO WATCH 166...167...
VALID 240005Z - 240200Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 166...167...CONTINUES.
CLUSTER OF SVR TSTMS -- INCLUDING SVR LEFT- AND RIGHT-MOVING
SUPERCELLS -- SHOULD CONTINUE ACROSS PLAINS BELOW CAPROCK...WITH
RIGHT-MOVING MEMBER HEADING GENERALLY ALONG I-20 TOWARD SWW AREA AND
LEFT MOVERS CROSSING PORTIONS GARZA/KENT/DICKENS/CROSBY COUNTIES.
PREVIOUSLY TORNADIC ACTIVITY OVER NWRN OK IS MOVING NWD INTO WW
168...AS WELL AS LEFT-MOVING TSTM WHICH PRODUCED HAIL ESTIMATED NEAR
1 INCH DIAMETER OVER BEAVER COUNTY OK. ISOLATED/SMALL SUPERCELL
EVIDENT AT 2330Z CARSON COUNTY TX...WITH PRONOUNCED VISUAL SUPERCELL
CHARACTERISTICS BASED ON STORM OBSERVER REPORTS AND AMA AREA
TOWER-CAMS DURING PAST HOUR...MAY TURN MORE RIGHTWARD AND CROSS
PORTIONS NRN GRAY/SRN ROBERTS COUNTIES NEXT 1-2 HOURS.
ADDITIONAL DEVELOPMENT S OF I-40 AND N OF PERMIAN BASIN CLUSTER HAS
FAILED TO BECOME SUSTAINED SO FAR...AND MAY CONTINUE TO BE LIMITED
BY CONTINUED IMPEDIMENT OF REMAINING INSOLATION BY THICK HIGH CLOUD
COVER. STILL...ADDITIONAL TSTM DEVELOPMENT IS POSSIBLE ALONG
DRYLINE...WHICH MAY CONTINUE TO RETREAT FOR A FEW MORE HOURS GIVEN
BACKING OF FLOW AND ISALLOBARIC FORCING EVIDENT TO ITS W. ANY TSTMS
WHICH DO DEVELOP INTO MOIST SECTOR MAY BECOME SUPERCELLULAR GIVEN
FAVORABLE VERTICAL SHEAR PROFILES FCST TO CONTINUE ACROSS MOIST
SECTOR...AS WELL AS MOIST ADVECTION EXPECTED OVER NEXT SEVERAL
HOURS. FCST HODOGRAPHS APPEAR FAVORABLE FOR LEFT-SPLITS AND
ASSOCIATED HAIL RISK AS WELL.
.EDWARDS.. 04/24/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...OUN...DDC...SJT...LUB...AMA...MAF...
32500189 34100181 36080193 36930196 37009850 36399855
34569889 32089912 31569977 31110191
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