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Mesoscale Discussion 491
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   Mesoscale Discussion 0491
   NWS Storm Prediction Center Norman OK
   0248 PM CDT Tue May 22 2018

   Areas affected...Southeast Indiana...Extreme North Central
   Kentucky...Ohio...Western Pennsylvania...Northern West Virginia
   Panhandle...Lake Erie

   Concerning...Severe Thunderstorm Watch 115...

   Valid 221948Z - 222145Z

   The severe weather threat for Severe Thunderstorm Watch 115
   continues.

   SUMMARY...Strong to severe storms with a severe hail and damaging
   wind gust threat continues in WW 115.

   DISCUSSION...Strong storms continue for the northern portions of WW
   115. Severe wind and hail have been reported with these storms.
   Further to the west, storms initiated and only briefly progressed
   eastward. In their wake they have left an outflow boundary that is
   demarcated by a line of agitated cumulus and a few thunderstorms per
   visible satellite imagery.

   Going forward, storms in the northern portion should continue to
   progress eastward. Ample shear is present in the environment --
   40-45 kts of 0-6 km shear -- per the KCLE VAD profile. Dewpoints in
   the mid- to upper-60s have contributed to between 1500-2000 J/kg
   MLCAPE. The environment will continue to be supportive of both
   severe hail and damaging wind gusts. Further to the west and south,
   more uncertainty exists as to whether new storm development will
   occur. Intermittent cells have existed near the outflow boundary,
   but have yet to become sustained.

   Storms along the eastern periphery of the watch may require local
   extensions of WW 115 from Forest County down to Indiana County in
   Pennsylvania within the next hour.

   ..Wendt.. 05/22/2018

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

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

   LAT...LON   41428211 41588147 41818066 41848012 41738005 41417983
               40127991 39478136 39038256 38458469 38548514 39078526
               39838517 40458471 40768409 40888381 41158289 41428211 

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Page last modified: May 22, 2018
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