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Mesoscale Discussion 449
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   MESOSCALE DISCUSSION 0449
   NWS STORM PREDICTION CENTER NORMAN OK
   0431 AM CDT SAT APR 25 2015

   AREAS AFFECTED...SOUTH-CENTRAL TX/HILL COUNTRY

   CONCERNING...SEVERE THUNDERSTORM WATCH 107...

   VALID 250931Z - 251100Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 107
   CONTINUES.

   SUMMARY...LARGE HAIL/LOCALLY DAMAGING WIND POTENTIAL WILL CONTINUE
   TO SPREAD EASTWARD ACROSS SOUTH-CENTRAL TX/HILL COUNTRY VICINITY
   EARLY THIS MORNING...INCLUDING PARTS OF THE SAN ANTONIO METRO AREA
   THROUGH AT LEAST 530 AM CDT.

   DISCUSSION...SCATTERED RIGHT-MOVING/SLIGHTLY ELEVATED SUPERCELLS
   HAVE CONTINUED TO INCREASE/SPREAD EASTWARD ACROSS ACROSS THE HILL
   COUNTRY EARLY THIS MORNING IN VICINITY OF A WEAK WEST/SOUTHWEST TO
   EAST/NORTHEAST ORIENTED SURFACE BOUNDARY. LARGE HAIL WILL REMAIN A
   DISTINCT CONCERN THROUGH THE EARLY MORNING WITHIN AN ENVIRONMENT
   CHARACTERIZED BY MODERATELY STEEP MID-LEVEL LAPSE RATES/MODERATE
   BUOYANCY AND STRONG/UNIDIRECTIONAL SOUTHWESTERLY WINDS THROUGH THE
   CLOUD BEARING LAYER. LATEST WSR-88D VWP DATA FROM LAUGHLIN AFB IS
   CONSISTENT WITH EFFECTIVE SHEAR OF AT LEAST 40-50 KT. WHILE LARGE
   HAIL REMAINS THE PRIMARY THREAT EARLY THIS MORNING...IT IS
   CONCEIVABLE THAT UPSCALE QUASI-LINEAR GROWTH COULD OCCUR SUCH THAT
   DAMAGING WINDS BECOME MORE OF A CONCERN THROUGH EARLY/MID-MORNING.

   ..GUYER.. 04/25/2015


   ATTN...WFO...HGX...CRP...EWX...

   LAT...LON   28619910 29020058 29560075 29939913 30419715 30329610
               29449588 28669676 28629898 28619910 

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Page last modified: April 25, 2015
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