Mesoscale Discussion 0242
   NWS Storm Prediction Center Norman OK
   0322 PM CDT Wed Mar 24 2021
   Areas affected...Central/North-Central TX
   Concerning...Severe potential...Watch likely 
   Valid 242022Z - 242245Z
   Probability of Watch Issuance...80 percent
   SUMMARY...Thunderstorm development is anticipated this evening
   across western portions of central and north-central TX. Threat for
   large hail, damaging wind gusts, and perhaps a tornado or two will
   accompany this storms as they move northeastward into more of
   central and north-central TX. Trends are being monitored for
   possible watch issuance.
   DISCUSSION...Recent surface analysis places a weak low just
   southeast of BWD in central TX. A warm front extends eastward from
   this low, demarcated well by both the 56 deg F isodrosotherm and the
   edge of the cloud shield in visible satellite imagery. A surface
   trough also extends southwestward from this low before arcing back
   northwestward south of SJT into the TX Permian Basin. 
   The air mass south of the warm front also continues to destabilize,
   particularly over the TX Hill County in the vicinity of the low.
   Recent mesoanalysis suggests MLCAPE around 500 J/kg near the low,
   increasing to over 1000 J/kg over in the region between Del Rio and
   San Antonio. Continued destabilization is expected as the warm front
   continue to move northward. 
   At the same time, persistent low-level convergence in the vicinity
   of the low and its associated surface trough is expected to result
   in eventual convective initiation. Visible satellite imagery has
   shown several attempts at deep convection, although none have
   succeeded thus far. Current attempt is underway over McCulloch
   County. In addition to this mesoscale forcing, large-scale forcing
   for ascent is gradually increasing across the region as a shortwave
   trough approaches from the west.
   Once convective initiation is realized, the environment is favorable
   for maturation into supercells. Primary hazard throughout the
   evening will be large hail while some damaging downburst winds are
   also possible. Gradually strengthening low-level could also result
   in a tornado or two.
   ..Mosier/Hart.. 03/24/2021
   ...Please see www.spc.noaa.gov for graphic product...
   ATTN...WFO...SHV...FWD...EWX...SJT...