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Mesoscale Discussion 554
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   MESOSCALE DISCUSSION 0554
   NWS STORM PREDICTION CENTER NORMAN OK
   0650 PM CDT FRI MAY 08 2015

   AREAS AFFECTED...SRN OK...NORTH TX

   CONCERNING...TORNADO WATCH 143...

   VALID 082350Z - 090115Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 143 CONTINUES.

   SUMMARY...A SEVERE THREAT IS EXPECTED TO CONTINUE ACROSS NCNTRL TX
   AND SCNTRL OK. THE THREAT SHOULD GRADUALLY DEVELOP EWD INTO SE OK
   AND NE TX OVER THE NEXT FEW HOURS. A TORNADO THREAT ALONG WITH
   POTENTIAL FOR WIND DAMAGE AND LARGE HAIL WILL EXIST WITH THE MORE
   INTENSE STORMS. A REPLACEMENT WATCH WILL BE REQUIRED BEFORE 02Z.

   DISCUSSION...THE LATEST RADAR IMAGERY SHOWS SEVERAL CLUSTERS OF
   STRONG TO SEVERE STORMS FROM CNTRL OK SWWD INTO NW TX AND
   THUNDERSTORMS ASSOCIATED WITH WARM ADVECTION ALSO DEVELOPING ACROSS
   NORTH TX AND SRN OK. SFC DEWPOINTS IN SRN OK AND NORTH TX ARE IN THE
   LOWER 70S F...CONTRIBUTING TO MLCAPE IN THE 2500 TO 3000 J/KG. IN
   ADDITION TO THE MODERATE INSTABILITY...THE FORT WORTH WSR-88D VWP
   SHOWS DIRECTIONAL SHEAR IN THE LOW TO MID-LEVELS WITH STRONG SPEED
   SHEAR ABOVE 4 KM...CREATING 50 KT OF 0-6 KM SHEAR. BOUNDARY-LAYER
   SHEAR SHOULD INCREASE SOME THIS EVENING AS A 35 TO 45 KT LOW-LEVEL
   JET STRENGTHENS ACROSS NCNTRL TX. THIS SHOULD BE FAVORABLE FOR
   TORNADOES WITH THE MORE DOMINANT SUPERCELLS. STORMS THAT ROTATE
   SHOULD ALSO CONTAIN A THREAT FOR LARGE HAIL AND WIND DAMAGE. THE
   WIND DAMAGE THREAT MAY BECOME ENHANCED WITH BOWING LINE-SEGMENTS.

   ..BROYLES/MEAD.. 05/08/2015


   ATTN...WFO...SHV...TSA...FWD...OUN...SJT...

   LAT...LON   32719567 32699699 32649844 33019906 33469903 34029825
               34829747 34959624 34569485 32719567 

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Page last modified: May 09, 2015
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