Mesoscale Discussion 0903
   NWS Storm Prediction Center Norman OK
   0535 PM CDT Wed Jun 10 2020

   Areas affected...Central/eastern Ohio...northeastern
   Kentucky....northwestern West Virginia...western
   Pennsylvania...southwestern New York and Lake Erie

   Concerning...Severe Thunderstorm Watch 277...

   Valid 102235Z - 110000Z

   The severe weather threat for Severe Thunderstorm Watch 277
   continues.

   SUMMARY...An evolving squall line will overspread much of the
   region, including much of the Greater Cleveland area by 8-9 PM EDT,
   and perhaps Greater Pittsburgh by 9-11 PM EDT, accompanied by the
   risk for potentially damaging wind gusts.  A new severe weather
   watch will probably be issued shortly.

   DISCUSSION...A narrow broken pre-frontal squall line continues to
   evolve, aided by inflow of seasonably moist boundary layer air
   characterized by CAPE in excess of 2000 J/kg.  The line appears
   largely parallel to the 50-60 kt cyclonic, south-southwesterly
   deep-layer ambient mean flow, but given the strength of the slow,
   potential for severe gusts probably will continue in northeastward
   surging segments into the 01-03Z time frame.  

   The line of storms appears to be in the process of continuing to
   fill in along the leading edge of consolidating cold pools, which
   appears to be propagating eastward at 30-35 kt.  At this pace,
   activity should overspread much of the remainder of eastern Ohio,
   southern Lake Erie, portions of northwestern West Virginia, western
   Ohio and southwestern New York by 01-03Z

   ..Kerr.. 06/10/2020

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

   ATTN...WFO...BUF...PBZ...RLX...CLE...ILN...

   LAT...LON   41618237 41878182 42617948 41647968 40118023 38578139
               38198267 38498312 39478270 40588250 41618237