Severe Storm Outlook Narrative (AC)
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328
ACUS11 KWNS 232054
SWOMCD
SPC MCD 232053
PAZ000-MDZ000-WVZ000-VAZ000-OHZ000-KYZ000-232300-

Mesoscale Discussion 1139
NWS Storm Prediction Center Norman OK
0353 PM CDT Fri Jun 23 2017

Areas affected...Northern KY...Southern OH...Northern WV...Western
MD...Southern PA

Concerning...Severe Thunderstorm Watch 366...

Valid 232053Z - 232300Z

The severe weather threat for Severe Thunderstorm Watch 366
continues.

SUMMARY...The threat for damaging winds and perhaps a brief tornado
continues.

DISCUSSION...Several clusters of thunderstorms are ongoing across
the valid portion of WW 366, with a tendency for convection to
evolve into short line segments. This mode is generally expected to
continue, given unidirectional southwesterly wind profiles across
the region. Periodic damaging wind gusts will be possible with these
line segments, while a brief tornado also cannot be ruled out, given
relatively strong 0-1 km shear of 20-30 kts noted in VWPs from CCX
and PBZ. A somewhat greater conditional threat of a tornado or two
would exist with any discrete cells that can be maintained, though
thus far convection has rather quickly evolved into line segments as
storms intensify.

A cluster of storms moving into southeast PA will begin to move out
of WW 366 within the hour, posing some severe threat into at least
southeast PA. Please refer to MCD 1135 for additional details
regarding the severe threat downstream of WW 366.

..Dean.. 06/23/2017

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

ATTN...WFO...PHI...CTP...LWX...PBZ...RLX...JKL...ILN...LMK...

LAT...LON   38768446 39388245 39967991 40477789 40597644 40287580
            39687638 39607762 39317904 38938129 38478294 38328439
            38378442 38768446




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