Mesoscale Discussion 0489
   NWS Storm Prediction Center Norman OK
   0615 PM CDT Tue Apr 28 2020

   Areas affected...northeast Oklahoma...southwest Missouri and
   northwest Arkansas

   Concerning...Tornado Watch 150...

   Valid 282315Z - 290115Z

   The severe weather threat for Tornado Watch 150 continues.

   SUMMARY...Storms will continue to pose a risk for damaging wind,
   large hail and a few tornadoes as they move through northeast OK,
   southwest MO and northwest AR through 01Z.

   DISCUSSION...Early this evening a broken squall line extends from
   southwest MO through northeast and north-central OK moving southeast
   around 35 kt. The atmosphere remains very unstable downstream from
   the line with 3000-3500 J/kg MLCAPE supported by mid-upper 60s F
   dewpoints and steep lapse rates. VWP data from Tulsa has indicated
   some increase low-level shear during the past hour with 0-1 km
   storm-relative helicity around 250 m2/s2 from northeast OK into
   southwest MO to the south and southeast of a meso-low circulation.
   Otherwise, 40-50 kt effective bulk shear remains more than
   sufficient for organized structures including a few bowing segments
   and embedded supercells.

   ..Dial.. 04/28/2020

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

   ATTN...WFO...LZK...SGF...TSA...OUN...

   LAT...LON   36009603 36569512 36969466 37299417 36699347 35679362
               34849591 35379637 36009603