Mesoscale Discussion 1347
   NWS Storm Prediction Center Norman OK
   0736 PM CDT Sun Jul 26 2020

   Areas affected...South TX

   Concerning...Tornado Watch 403...

   Valid 270036Z - 270200Z

   The severe weather threat for Tornado Watch 403 continues.

   SUMMARY...The threat for tornadoes associated with Tropical
   Depression Hanna is expected to diminish late this evening into the
   overnight hours.

   DISCUSSION...The tornado threat across South TX, associated with
   Tropical Depression Hanna, is expected to diminish into the
   overnight hours. Some weak, transient rotation in embedded cells
   near the Rio Grade River west of the McAllen vicinity has been noted
   over the past couple of hours, and may persist across parts of Starr
   and Zapata Counties for a couple more hours. When adjusting for
   storm motion, 00z BRO and CRP RAOBs indicate around 50 m2/s2 0-1 km
   SRH, which is consistent with current values sampled in VWP data. As
   Hanna continues to drift west/southwest and weaken overnight, low
   level shear is expected to continue to weaken and become
   increasingly unfavorable for low level rotation and tornadoes.
   Tornado Watch 403 is set to expire at 03z, and a new watch is not
   expected upon cancellation/expiration.

   ..Leitman.. 07/27/2020

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

   ATTN...WFO...CRP...EWX...BRO...

   LAT...LON   25849738 25839740 25849741 25849741 26059820 26069825
               26249866 26399908 26399908 26429911 28190020 28190020
               28200011 28209938 28189748 28139731 28139731 27669670
               26069675 26059675 26029675 25999676 25959676 25839737
               25849738 25849738