|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
Concerning...Severe Thunderstorm Watch 115...
Valid 221948Z - 222145Z
The severe weather threat for Severe Thunderstorm Watch 115
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.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 41428211 41588147 41818066 41848012 41738005 41417983
40127991 39478136 39038256 38458469 38548514 39078526
39838517 40458471 40768409 40888381 41158289 41428211
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