|Mesoscale Discussion 799|
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Mesoscale Discussion 0799
NWS Storm Prediction Center Norman OK
1113 AM CDT Sat May 20 2017
Areas affected...Northwest TN...Western KY...Southeast
Concerning...Severe potential...Watch possible
Valid 201613Z - 201745Z
Probability of Watch Issuance...40 percent
SUMMARY...Scattered strong thunderstorms are expected to develop
across portions of the Ohio Valley this afternoon. Locally damaging
winds are possible.
DISCUSSION...Boundary-layer heating is contributing to increased
buoyancy south of the OH River across much of KY and TN.
Surface-3km lapse rates have increased to near 8 C/km and CINH is
very weak across this region. Over the last half hour or so CU
field has expanded markedly across western TN/KY such that showers
are developing, and evening isolated thunderstorms. It appears
convection will gradually deepen along a boundary that is currently
draped from southern IN, southwest into western TN. This activity
is evolving along eastern-most fringe of stronger flow aloft that
will aid potential storm organization. Locally damaging winds may
accompany this activity as it spreads/develops northeast into
southern portions of IN/OH.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 36458857 38538711 39918538 39268393 37418549 35848757
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