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Mesoscale Discussion 244
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MD 244 graphic

   Mesoscale Discussion 0244
   NWS Storm Prediction Center Norman OK
   0553 PM CDT Fri Apr 13 2018

   Areas affected...much of Arkansas...northern/central Louisiana...and
   northeastern Texas

   Concerning...Tornado Watch 40...

   Valid 132253Z - 140030Z

   The severe weather threat for Tornado Watch 40 continues.

   SUMMARY...Tornado Watch 40 continues across the discussion area. 
   Some uptick of convection on the southeastern periphery of the watch
   has been noted and may potentially necessitate local spatial
   extensions.

   DISCUSSION...The severe threat continues across Tornado Watch 40. 
   Throughout the day, storms have generally struggled to intensify
   above severe levels - probably due to lingering mid-level inhibition
   and less steep lapse rates compared to areas west (i.e., far western
   Arkansas).  Latest radar observations/satellite suggests that this
   scenario may be gradually changing as insolation/surface heating has
   resulted in gradually deepening convection in central/northern
   Louisiana an adjacent areas of northeastern Texas.  A few of the
   cells in northern Louisiana have exhibited weak rotation in the past
   30 minutes.  Surface temperatures have approached 80F in this area,
   supporting moderate instability especially across the southern half
   of the WW area.  With time, the combination of storms migrating into
   the watch area from the west, in addition to storms gradually
   increasing in the southern half of the WW, a gradually increasing
   low-level jet, and cooling mid-level temperatures will likely result
   in an increased threat for all severe hazards into the evening
   hours.  This includes the potential for a couple of strong
   tornadoes.  Furthermore, local spatial extensions of WW 40 may be
   needed if convection organizes further across central/north-central
   Louisiana.

   ..Cook.. 04/13/2018

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

   ATTN...WFO...PAH...MEG...JAN...LZK...SGF...LCH...SHV...TSA...
   HGX...FWD...

   LAT...LON   36559336 36629294 36579169 36529083 36439033 36118996
               35689005 34899043 33819094 33069112 32039173 31579191
               31019246 30649312 30549394 30619461 30989539 31489573
               32299552 32919534 33679510 34239489 34749453 35219414
               36559336 

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