SWOMCD
SPC MCD 241718
OKZ000-TXZ000-241845-
MESOSCALE DISCUSSION 0925
NWS STORM PREDICTION CENTER NORMAN OK
1218 PM CDT TUE MAY 24 2011
AREAS AFFECTED...NW TX...WRN AND CNTRL OK
CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY
VALID 241718Z - 241845Z
STORM INITIATION IS EXPECTED ACROSS WRN OK AND NW TX OVER THE NEXT
HOUR. SUPERCELLS SHOULD RAPIDLY DEVELOP WITH A THREAT FOR LARGE HAIL
AND TORNADOES. A TORNADO WATCH WILL LIKELY NEED TO BE ISSUED BY 18Z.
SFC ANALYSIS SHOWS A 997 MB LOW IN THE NRN TX PANHANDLE WITH A
DRYLINE EXTENDING SWD FROM THE LOW ACROSS FAR WRN OK INTO WEST TX.
THE DRYLINE IS STARTING TO ADVANCE EWD WITH VISIBLE SATELLITE
IMAGERY SHOWING AN EXPANDING FIELD OF CUMULUS FROM I-40 IN WRN OK
SWD TO NEAR SAN ANGELO IN WCNTRL TX. AS FURTHER DESTABILIZATION
OCCURS THIS AFTERNOON AND THE CAP WEAKENS...RAPID CELL INITIATION IS
EXPECTED TO OCCUR ALONG THIS CORRIDOR. AS THIS OCCURS...A 50 TO 65
KT MID-LEVEL JET EJECTING NEWD TOWARD THE SRN PLAINS WILL CREATE
STRONG DEEP LAYER SHEAR PROFILES VERY FAVORABLE FOR SUPERCELLS. AS
STORMS INTENSIFY...VERY LARGE HAIL GREATER THAN 2 INCHES IN DIAMETER
WILL BECOME LIKELY. IN ADDITION...A 30 TO 40 KT LOW-LEVEL JET IS IN
PLACE ACROSS NW TX AND WRN OK. AS THIS FEATURE
STRENGTHENS...LOW-LEVEL SHEAR WILL BECOME VERY FAVORABLE FOR
TORNADOES. WITH 0-3 KM STORM RELATIVE HELICITIES INCREASING INTO THE
450 TO 600 M2/S2 RANGE...LONG-TRACK STRONG TORNADOES ARE EXPECTED TO
OCCUR LATE THIS AFTERNOON INTO EARLY THIS EVENING.
..BROYLES.. 05/24/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TSA...FWD...OUN...SJT...LUB...
LAT...LON 36359864 35549906 34789972 34469989 33560003 32959970
32809942 32789855 33159793 33799761 34609702 35689660
36409722 36629823 36359864
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