|Mesoscale Discussion 785|
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Mesoscale Discussion 0785
NWS Storm Prediction Center Norman OK
0450 PM CDT Fri May 19 2017
Areas affected...Portions of southern/central OH...northern
KY/WV...and southwestern PA
Concerning...Severe Thunderstorm Watch 247...
Valid 192150Z - 192245Z
The severe weather threat for Severe Thunderstorm Watch 247
SUMMARY...Mainly an isolated strong to locally damaging wind threat
continues across Severe Thunderstorm Watch 247.
DISCUSSION...A few sub-severe wind gusts have been noted over the
past hour or so with a loosely organized cluster of thunderstorms
moving eastward across southern OH and northern KY. Although
temperatures have generally warmed into the 80s this afternoon ahead
of this activity, poor mid-level lapse rates noted on the 18Z ILN
sounding have limited MLCAPE to 500-1000 J/kg to the south of a
stalled frontal boundary across central OH. Generally unidirectional
westerly low to mid-level flow strengthens modestly with height, and
30-35 kt of effective bulk shear will continue to support some storm
organization, with mainly isolated strong to locally damaging winds
remaining the main threat though the early evening. The loss of
diurnal heating should reduce instability and the overall severe
threat later this evening.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 38768464 38968447 39248368 40158270 40398067 40117967
39477967 38568116 38608467 38768464
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