Mesoscale Discussion 1336
   NWS Storm Prediction Center Norman OK
   0129 PM CDT Sat Jul 25 2020

   Areas affected...Texas coastal area

   Concerning...Severe potential...Watch possible 

   Valid 251829Z - 252045Z

   CORRECTED TO REFERENCE HURRICANE HANNA

   Probability of Watch Issuance...40 percent

   SUMMARY...Threat for a few brief tornadoes is expected to undergo a
   gradual increase this afternoon into the early evening. Convective
   trends will continue to be monitored for a possible tornado watch.

   DISCUSSION...As of early afternoon the center of Hurricane Hanna was
   located just off the south Texas coast, moving slowly west. See the
   latest discussions from the National Hurricane center for more
   specifics on Hanna. North of the center, shallow convection
   (including a few thunderstorms) within the outer rainbands are
   moving inland from the western Gulf. Low-level hodograph size has
   increased in corridor between Corpus Christi and Houston with 0-1 km
   storm relative helicity from 300-500+ m2/s2, and modest updraft
   rotation has been observed with a few of the discrete cells. The
   warm core nature of the Hurricane and widespread clouds are
   resulting in marginal instability. However, some cloud breaks are
   evident between bands, especially along the central Texas coast, and
   this might result in sufficient boundary layer destabilization to
   support slightly more robust updrafts. As the center continues
   westward and eventually moves inland, hodographs will remain
   favorable for low-topped supercells capable of a few brief
   tornadoes.

   ..Dial/Hart.. 07/25/2020

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

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

   LAT...LON   27969694 27699731 28069789 28779761 29609628 29739511
               29179507 28339646 27969694