Mesoscale Discussion 0330
   NWS Storm Prediction Center Norman OK
   0227 AM CDT Fri Apr 10 2020

   Areas affected...The lower Rio Grande Valley

   Concerning...Severe potential...Watch unlikely 

   Valid 100727Z - 100900Z

   Probability of Watch Issuance...20 percent

   SUMMARY...Isolated large hail and damaging gusts will be possible
   through about 10z along the lower Rio Grande Valley.  The threat
   area is relatively small and is unlikely to extend much beyond areas
   already affected, but this narrow corridor will still be monitored
   for a possible severe thunderstorm watch.

   DISCUSSION...Two supercells have formed since 06z near the Rio
   Grande, and some additional storm development will be possible
   through 08-09z in a zone of low-level ascent in the vicinity of a
   surface cold front.  A moderately unstable warm sector persists
   along and south of the front, though convective inhibition is
   expected to slowly increase and the remaining warm sector will be
   suppressed southward as the front continues to sag southward this
   morning.  In the interim, the mesoscale environment along and on the
   immediate cool side of the boundary will help sustain an isolated
   large hail/damaging wind threat with the supercell storms and/or
   upscale growth into a small cluster near the Rio Grande, from Zapata
   to Hidalgo Counties.  Confidence is relatively low that the storms
   will maintain intensity past Hidalgo County.

   ..Thompson.. 04/10/2020

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

   ATTN...WFO...BRO...

   LAT...LON   26899939 27219940 27199890 26879852 26559808 26249802
               26099823 26439910 26899939