Mesoscale Discussion 0842
   NWS Storm Prediction Center Norman OK
   1032 PM CDT Mon May 27 2019

   Areas affected...Parts of central and southern Ohio into parts of
   northwest West Virginia

   Concerning...Tornado Watch 266...

   Valid 280332Z - 280500Z

   The severe weather threat for Tornado Watch 266 continues.

   SUMMARY...The risk for supercells capable of producing tornadoes
   continues, and may persist at least another couple of hours, into
   the Midnight to 2 AM EDT time frame, across and south of the
   Interstate 70 corridor of Ohio.  Trends are being monitored for the
   possibility of an additional Tornado Watch to the southeast of
   Tornado Watch 266.

   DISCUSSION...The ongoing cluster of severe thunderstorms has failed
   to produce substantive convective outflow, and strongest storms have
   remained generally discrete in nature with a number of supercells
   continuing to develop and track east-southeastward across the
   Interstate 70 corridor roughly between Dayton and Columbus.  This
   includes one cell which has likely produced a strong tornado across
   the Dayton Metropolitan area.  

   It is possible that recent activity has been augmented by at least
   some strengthening of the west-southwesterly 850 mb jet, atop the
   decoupling boundary layer to the warm side of the front.  However,
   it remains unclear how much longer this will persist, with boundary
   layer instability to the warm side of the front gradually waning
   with the loss of daytime heating.  And models suggest supporting
   lift associated with low-level warm advection may tend to shift more
   eastward than southeastward across the remainder of central/southern
   Ohio through 05-06z.  However, in the near term, large clockwise
   curved low-level hodographs will maintain a continuing risk for
   tornadoes with the stronger supercells as they progress south of
   Interstate 70.

   ..Kerr.. 05/28/2019

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

   ATTN...WFO...PBZ...RLX...CLE...ILN...IWX...

   LAT...LON   40718397 40448250 40238154 39498126 38928201 39088326
               39528451 40328456 40718397