|Mesoscale Discussion 1256|
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Mesoscale Discussion 1256
NWS Storm Prediction Center Norman OK
1207 PM CDT Fri Jul 07 2017
Areas affected...southern OH and a large portion of WV
Concerning...Severe potential...Severe Thunderstorm Watch likely
Valid 071707Z - 071800Z
Probability of Watch Issuance...80 percent
SUMMARY...A new severe thunderstorm watch will likely be needed by
130-200 PM EDT as a squall line over west-central OH moves to the
southeast with a corresponding risk for isolated wind damage.
DISCUSSION...Radar mosaic during the past hour has shown a
reorientation of a convective cluster into west-southwest to
east-northeast squall line. The Marion, OH ASOS measured a 43-kt
gust at 1633Z. Surface conditions over southwest OH have warmed
into the middle 80s degrees F with cooler temperatures in the upper
70s over southeastern OH to the north of an outflow boundary.
Visible satellite imagery shows a swelling cumulus field across
southwestern into south-central OH. To the northeast of the
early-day outflow, an absence of cumulus has been noted. This
likely delineates a southwest-northeast zone in which the boundary
layer will appreciably destabilize and foster a greater threat for
wind damage compared to perhaps more of a localized risk to the
Expecting a gradual intensification of thunderstorms this afternoon.
Isolated swaths of 50-60 mph winds will be capable of wind damage.
An eddy or two embedded within the line may yield a brief/weak
tornado or swath of wind damage.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 37708193 39148348 39288258 40678164 38927957 38028074
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