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Mesoscale Discussion 799
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   MESOSCALE DISCUSSION 0799
   NWS STORM PREDICTION CENTER NORMAN OK
   0601 PM CDT TUE MAY 06 2008
   
   AREAS AFFECTED...SOUTHEAST NM AND SOUTHWEST/FAR WEST TX
   
   CONCERNING...TORNADO WATCH 267...
   
   VALID 062301Z - 070030Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 267 CONTINUES.
   
   TORNADO WATCH 267 CONTINUES UNTIL 03Z...WITH POTENTIAL FOR ISOLATED
   TORNADOES AND LARGE HAIL. AN ADDITIONAL WATCH AND/OR LOCAL EXPANSION
   MAY BE NEEDED SOON EAST OF WW 267.
   
   SEVERE STORMS/SCATTERED SUPERCELLS CONTINUE TO INCREASE ACROSS THE
   TRANSPECOS REGION/TX SOUTH PLAINS EARLY THIS EVENING. MOST
   NOTEWORTHY SUPERCELL AS OF 2250Z IS OCCURRING SSW OF MIDLAND. THIS
   STORM HAS EXHIBITED STRONG ROTATION/POSSIBLE BRIEF TORNADO...AS IT
   CONTINUES TO ADVANCE EASTWARD ACROSS EASTERN CRANE INTO UPTON COUNTY
   IN THE SHORT TERM. THE BOUNDARY LAYER HAS TENDED TO CONTINUE TO
   HEAT/MIX IMMEDIATELY AHEAD OF THIS STORM...BUT SOMEWHAT BACKED LOW
   LEVEL SOUTHEASTERLY FLOW WILL CONTRIBUTE TO HEIGHTENED LOW LEVEL SRH
   FAVORABLE FOR A TORNADO THREAT.
   
   FARTHER NORTH...STORMS CONTINUE TO EXPAND NEWD ACROSS THE TX SOUTH
   PLAINS SSW OF LUBBOCK. WITH INCREASING DEEP LAYER SHEAR AND LOWER TO
   MIDDLE 60S F BOUNDARY LAYER DEWPOINTS HAVING CREPT NORTHWARD AHEAD
   OF THIS EVOLVING ACTIVITY...A FAVORABLE ENVIRONMENT EXISTS AHEAD OF
   THIS ACTIVITY. A WATCH EXTENSION OR NEW WATCH MAY BE NEEDED SOON.
   
   UPSTREAM OF THIS EXISTING ACTIVITY...ADDITIONAL DEVELOPMENT IS
   ANTICIPATED ACROSS EASTERN NM INTO FAR WEST TX AS THIS EVENING AS
   LARGE SCALE DEEP ASCENT CONTINUES TO INCREASE AHEAD OF UPPER TROUGH
   CROSSING THE SOUTHERN ROCKIES/NORTHERN MEXICO.
   
   ..GUYER.. 05/06/2008
   
   
   ATTN...WFO...EWX...SJT...LUB...MAF...ABQ...
   
   31270383 33500366 34330279 34270085 32350067 30270151 
   
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Page last modified: May 07, 2008
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