MESOSCALE DISCUSSION 0527
   NWS STORM PREDICTION CENTER NORMAN OK
   0808 PM CDT WED MAY 06 2015

   AREAS AFFECTED...WRN AND CENTRAL OK/WRN N TX

   CONCERNING...TORNADO WATCH 133...

   VALID 070108Z - 070215Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 133 CONTINUES.

   SUMMARY...SCATTERED SEVERE/SUPERCELL STORMS CONTINUE ACROSS PARTS OF
   WW 133 -- WHERE ALL-HAZARD SEVERE RISK PERSISTS.

   DISCUSSION...SEVERAL SEVERE/SUPERCELL STORMS ARE ONGOING ATTM FROM
   CENTRAL KS SWD INTO THE TX SOUTH PLAINS...IN AT LEAST THREE CLUSTERS
   -- ONE OVER NRN OK...ONE OVER CENTRAL OK...AND A THIRD OVER SWRN
   OK/WRN N TX.  STORM COVERAGE HAS GRADUALLY INCREASED -- PARTICULARLY
   OVER SRN PORTIONS OF THE WW AS THE LOW-LEVEL JET AND ASSOCIATED
   ASCENT/WARM ADVECTION INCREASE.  

   ATTM...IT APPEARS THAT SEVERE RISK -- MAINLY IN THE FORM OF LARGE
   HAIL AND LOCALLY DAMAGING WINDS -- MAY CONTINUE FOR AT LEAST THE
   NEXT FEW HOURS...GIVEN A BACKGROUND ENVIRONMENT WHICH REMAINS
   SUPPORTIVE FOR SUPERCELLS.  WHILE TENDENCY MAY BE FOR
   CLUSTERING/MESSIER STORM MODE WITH TIME -- AND AN INCREASE IN RISK
   FOR LOCALLY HEAVY RAIN...SEVERE/ISOLATED TORNADO POTENTIAL LIKELY TO
   PERSIST BEYOND 02Z /THE SCHEDULED EXPIRATION FOR WW 133/ SUGGESTS
   THAT A NEW WW FOR AT LEAST PARTS OF THIS AREA WILL BE NEEDED.

   ..GOSS.. 05/07/2015


   ATTN...WFO...ICT...FWD...OUN...DDC...SJT...AMA...

   LAT...LON   32469991 36940007 37019786 32549787 32469991