Mesoscale Discussion 1799
   NWS Storm Prediction Center Norman OK
   1127 AM CST Sun Nov 15 2020

   Areas affected...northeast OH

   Concerning...Severe Thunderstorm Watch 509...

   Valid 151727Z - 151900Z

   The severe weather threat for Severe Thunderstorm Watch 509
   continues.

   SUMMARY...Relatively higher concentration for potential severe gusts
   (60-70 mph) will probably focus near the I-90 corridor in northeast
   OH coincident with the longer duration cloud breaks evident in
   visible-satellite imagery.

   DISCUSSION...Visible-satellite imagery shows a relatively wider
   pocket of cloud breaks moving across northeast OH ahead of the
   thunderstorm band approaching the west-Cleveland suburbs as of
   1225pm EST.  The low-topped convective band is moving east around 50
   kt.  12pm EST surface observations in the greater Cleveland vicinity
   show temperatures have warmed into the upper 50s-60 deg F range. 
   Both 12z NAM and 16z RAP forecast soundings are too cool (1-4 deg C
   at the surface) and are therefore under-representing the magnitude
   of available buoyancy in objective analysis.  Given the strongly
   forced squall line rapid motion and appreciable destabilization
   located downstream over the I-90 corridor, expecting a relative
   concentration of severe gusts (60-70 mph) during the next 1-2 hours
   in the greater Cleveland vicinity.

   ..Smith.. 11/15/2020

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

   ATTN...WFO...CLE...

   LAT...LON   41528213 42078066 41458067 40808215 41528213