MESOSCALE DISCUSSION 0587
   NWS STORM PREDICTION CENTER NORMAN OK
   0544 PM CDT SUN APR 26 2009
   
   AREAS AFFECTED...PORTIONS CENTRAL/SRN KS...CENTRAL/WRN OK...NW
   TX...AND ERN TX PANHANDLE.
   
   CONCERNING...TORNADO WATCH 190...192...
   
   VALID 262244Z - 262345Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 190...192...CONTINUES.
   
   SEVERE THREAT -- INCLUDING POTENTIAL FOR SIGNIFICANT TORNADOES AND
   DAMAGING HAIL -- WILL CONTINUE ACROSS MUCH OF WW AREAS PAST
   SCHEDULED 00Z EXPIRATION TIME FOR WW 190...AND PROBABLY WELL PAST
   03Z EXPIRATION OF WW 192.  THEREFORE...WE ARE PLANNING TO REPLACE WW
   190 AND AT LEAST SOME OF 192 WITH ONE CONSOLIDATED/PDS TORNADO WATCH
   THAT WILL GO PAST MIDNIGHT LOCAL TIME. HASKELL/THROCKMORTON COUNTIES
   TX -- IN WFO SJT JURISDICTION -- ARE BEING SWITCHED FROM WW 192 TO
   WW 193.
   
   DAMAGING TORNADO ALREADY HAS BEEN OBSERVED BY MEDIA AND CHASERS WITH
   EARLIER STORM IN NW OK NOW MOVING INTO WOODWARD COUNTY...AND
   ENVIRONMENT WILL REMAIN FAVORABLE FOR MORE OF THESE WITH ANY
   RELATIVELY DISCRETE STORMS WHOSE INFLOW IS NOT TOO DISRUPTED BY
   OTHER ACTIVITY.  TORNADO POTENTIAL MAY INCREASE WITH
   PRONOUNCED/DISCRETE SUPERCELL IN SW OK...THAT SHOULD MOVE FROM FDR
   AREA NEWD TOWARD CADDO COUNTY DURING NEXT COUPLE HOURS.  ADDITIONAL
   ACTIVITY IS EXPECTED TO DEVELOP OVER ERN TX PANHANDLE AND NW TX AND
   MOVE NEWD AS WELL...WITH MIX OF LINEAR...EMBEDDED-SUPERCELL AND BOW
   MODES.  MODIFIED RAOBS...VWP/PROFILER DATA AND RUC SOUNDINGS ALL
   INDICATE BOUNDARY LAYER SHEAR REMAINING QUITE FAVORABLE AND
   REACTIVELY MAXIMIZED OVER WRN OK...EXTREME S-CENTRAL KS AND PORTIONS
   NW TX SW OF CDS -- E.G. 0-1 KM SRH 300-500 J/KG.  VERTICAL
   VEER/BACK/VEER PROFILE THAT HAS BEEN EVIDENT IN WIND PROFILES ACROSS
   THIS REGION APPEARS TO BE CONTRIBUTING TO SOME LINEAR
   TENDENCIES...BUT IS PROGGED TO BECOME MORE CLASSICALLY VEERING WITH
   HEIGHT THROUGH REMAINDER AFTERNOON/EVENING.  PRESSURE FALLS ANALYZED
   ACROSS NRN TX PANHANDLE...ERN OK PANHANDLE AND SWRN KS INDICATE SFC
   FLOW WILL REMAIN FAVORABLY BACKED OVER THIS REGION...KEEPING
   HODOGRAPHS ENLARGED.  NEARLY UNCAPPED AIR MASS WITH 1500-2000 J/KG
   MLCAPE WILL BE MAINTAINED THROUGH EVENING HOURS AS LOSS OF MIXING
   AND MOIST ADVECTION EACH KEEP EFFECTIVE INFLOW PARCELS NEARLY
   SFC-BASED.
   
   ..EDWARDS.. 04/26/2009
   
   
   ATTN...WFO...TSA...TOP...ICT...FWD...OUN...DDC...SJT...LUB...
   AMA...
   
   LAT...LON   35860053 37319900 38739755 38049630 36569698 35369675
               33899799 33019916 33020078 34610054 35860053