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Mesoscale Discussion 837
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   MESOSCALE DISCUSSION 0837
   NWS STORM PREDICTION CENTER NORMAN OK
   0448 PM CDT FRI MAY 29 2015

   AREAS AFFECTED...ERN OK...WRN AR...AND FAR SWRN MO

   CONCERNING...TORNADO WATCH 239...

   VALID 292148Z - 292315Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 239 CONTINUES.

   SUMMARY...SEVERE/TORNADO THREAT CONTINUES ACROSS WW 239...AND LOCAL
   EXTENSION MAY BE NEEDED DOWNSTREAM OF CURRENT CONVECTION.

   DISCUSSION...CONTINUE WW 239. BROKEN LINE OF STORMS PERSISTS FROM
   NEAR JLN SOUTHWARD TO NEAR TXK...WITH INDIVIDUAL THUNDERSTORMS
   WITHIN THE COMPLEX MOVING NEWD AROUND 30 KNOTS. A FEW OF THESE
   STORMS HAVE EXHIBITED ROTATION...ESPECIALLY IN NWRN AR AND SWRN MO.
   STORMS ARE IN AN ENVIRONMENT CHARACTERIZED BY 1000-2000 J/KG OF
   MUCAPE...WITH SELY SURFACE WINDS BENEATH 30-35 KNOT MID-LEVEL FLOW
   CONTRIBUTING TO 150-200 M2/S2 EFFECTIVE SRH SUPPORTING A CONTINUED
   TORNADO THREAT. STORMS THAT HAVE DEVELOPED NEAR ATOKA/BRYAN COUNTIES
   IN OK BENEATH MID-LEVEL VORT MAX MAY ALSO EXHIBIT A BRIEF TORNADO
   THREAT AS THEY MOVE INTO WW 239. AN EWD LOCAL EXTENSION OF THE WATCH
   MAY BE NEEDED AS STORMS CONTINUE GRADUAL EWD
   PROGRESSION...ESPECIALLY TOWARD NRN AR AND SCNTRL MO...WHERE
   GREATEST TORNADO THREAT EXISTS.

   ..COOK.. 05/29/2015


   ATTN...WFO...LZK...SGF...SHV...TSA...FWD...

   LAT...LON   33659544 34109577 34409575 34809539 35319496 36069472
               36689466 37069437 37149368 36949293 36089276 35219287
               34009312 33239346 33129390 33339486 33659544 

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Page last modified: May 29, 2015
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