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Mesoscale Discussion 81
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   Mesoscale Discussion 0081
   NWS Storm Prediction Center Norman OK
   1228 PM CST Wed Feb 21 2018

   Areas affected...Southern/Central/Northeast LA...Far Southeast TX

   Concerning...Tornado Watch 3...

   Valid 211828Z - 212000Z

   The severe weather threat for Tornado Watch 3 continues.

   SUMMARY...Conditions remain favorable for transient/brief tornadoes
   across southern/central/northeast LA.

   DISCUSSION...Convective cluster, with embedded supercells, continues
   to move northeastward across central LA into northeast LA. Rotation
   of varying strength has been observed within the supercells over the
   past hour with both constructive and destructive storm interactions
   noted. Wind fields, sampled well by the KPOE and KLCH VAD wind
   profiles, continue to show support (particularly in the lowest 3 km)
   for enough low-level updraft rotation to sustain a tornado threat.
   Very little change has been noted in the thermodynamic fields over
   the past hour, with the exception of northwest/north-central LA
   where the cold front has moved through. Consequently, overall
   conditions remain favorable for transient/brief tornadoes within the
   cluster moving across central LA as well as the newly developed line
   of storms approaching the central/southern TX/LA border.

   ..Mosier.. 02/21/2018

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

   ATTN...WFO...JAN...LIX...LCH...SHV...HGX...

   LAT...LON   32189303 32459203 32419097 31749125 29939243 29659270
               29629369 29769429 30289453 30839430 31509382 32189303 

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Page last modified: February 21, 2018
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