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Mesoscale Discussion 790
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   MESOSCALE DISCUSSION 0790
   NWS STORM PREDICTION CENTER NORMAN OK
   0542 PM CDT TUE MAY 26 2015

   AREAS AFFECTED...PORTIONS OF NRN TX...FAR SWRN OK

   CONCERNING...TORNADO WATCH 222...

   VALID 262242Z - 270015Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 222 CONTINUES.

   SUMMARY...THE THREAT FOR LARGE HAIL...DAMAGING WINDS...AND A COUPLE
   OF TORNADOES CONTINUES...ESPECIALLY OVER SERN PORTIONS OF THE WATCH.
   ADDITIONALLY...AREAL EXTENSION TO THE SE OF THE CURRENT WW MAY BE
   NECESSARY.

   DISCUSSION...SEVERAL CLUSTERS OF STRONG TO SEVERE THUNDERSTORMS HAVE
   DEVELOPED OVER THE WW EARLY THIS EVENING...WITH A BRIEF TORNADO
   TOUCHDOWN RECENTLY REPORTED IN PALO PINTO CO. THIS REPORT IS
   ASSOCIATED WITH AN HP SUPERCELL EMBEDDED WITHIN A LARGER CLUSTER TO
   THE WEST OF THE DFW METROPLEX. RECENT MESOANALYSIS AND AREA VWP DATA
   SUGGEST AMPLE DEEP-LAYER SHEAR /ON THE ORDER OF 35-45 KTS/ IS
   AVAILABLE FOR FURTHER UPDRAFT ORGANIZATION. HOWEVER...RELATIVELY
   MODEST 850-700 FLOW IS LIKELY RESULTING IN STRONG/DOMINANT COLD POOL
   GENERATION IN SEVERAL CELLS. THEREFORE...IN THE NEAR TERM...A LARGE
   HAIL THREAT /OWING TO STEEP MID-LEVEL LAPSE RATES AND SUBSTANTIAL
   BUOYANCY/ MAY BE THE PRIMARY CONCERN WITH SEVERAL CELLS QUICKLY
   BECOMING ELEVATED OVER STABLE DOWNDRAFT AIR. THE ONE EXCEPTION IS
   THE AFOREMENTIONED CELL OVER STEPHENS/PALO PINTO CO...WHICH MAY BE
   INGESTING ENHANCED HELICITY ALONG A REMNANT BOUNDARY FROM THE PRIOR
   DAY/S CONVECTION. AS IT MAY CONTINUE TO TRACK E/SE IN A FAVORABLE
   THERMODYNAMIC ENVIRONMENT...A SEWD AREAL EXTENSION MAY BECOME
   NECESSARY. MOREOVER...THERE MAY BE SOME SUBSTANTIVE INCREASE IN THE
   THREAT OVER MORE OF THE MCD AREA AS 850 FLOW STRENGTHENS LATER THIS
   EVENING.

   ..PICCA.. 05/26/2015


   ATTN...WFO...FWD...OUN...SJT...

   LAT...LON   32159975 32839985 34239956 34499896 34089773 33569747
               32239756 31969878 32159975 

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Page last modified: May 27, 2015
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