Mesoscale Discussion 0135
   NWS Storm Prediction Center Norman OK
   0530 PM CDT Sun Mar 18 2018

   Areas affected...north central through south central and east Texas

   Concerning...Severe Thunderstorm Watch 11...

   Valid 182230Z - 190030Z

   The severe weather threat for Severe Thunderstorm Watch 11
   continues.

   SUMMARY...Threat for isolated supercells capable of producing very
   large hail and damaging wind gusts will continue into the evening
   from a part of north central into south central and east Texas. WW
   11 might need to be extended farther south or possibly a small new
   watch east of San Antonio might be needed to account for potential
   new development.

   DISCUSSION...Early this evening isolated supercells that developed
   along the dryline persist primarily from southern portion of north
   central TX through south central TX. Visible imagery shows new high
   based towers growing over south central TX within the more deeply
   mixed regime along and just west of the dryline, as well as along a
   confluence zone east of the dryline where the warm sector is
   moderately unstable with steep lapse rates. A few of these new
   updrafts might also evolve into mature supercells as they interact
   with the strongly sheared and moderately unstable warm sector
   (MLCAPE 2000 J/kg). Low level hodographs are not particularly large,
   but strong effective bulk shear with unidirectional southwesterly
   winds increasing to 60 kt through 8 km will support both right and
   left movers.

   ..Dial.. 03/18/2018

   ...Please see www.spc.noaa.gov for graphic product...

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

   LAT...LON   30479771 30259695 30299572 29749593 29529657 29539739
               29829787 30479771