Severe Storm Outlook Narrative (AC)
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541
ACUS11 KWNS 200017
SWOMCD
SPC MCD 200016
PAZ000-MDZ000-NYZ000-VAZ000-WVZ000-200115-

Mesoscale Discussion 1533
NWS Storm Prediction Center Norman OK
0716 PM CDT Sat Aug 19 2017

Areas affected...Eastern PA...Western/Central MD...Far Northern
VA...Northeast WV

Concerning...Severe Thunderstorm Watch 457...

Valid 200016Z - 200115Z

The severe weather threat for Severe Thunderstorm Watch 457
continues.

SUMMARY...Damaging wind gusts from 30-40 kt will remain possible for
the next hour or so but the overall weakening trend noted in current
observations is expected to continue. No downstream watch
anticipated.

DISCUSSION...Convective line of moving through the region has shown
a general weakening trend over the past hour, particularly on the
southern extent where the storm outflow is well-defined by a fine
line in the radar reflectivity. New development is occurring along
this southeastward progressing outflow but updrafts have been weak
and duration has been short. A few occasionally strong updrafts are
still possible across this area (i.e. northeast WV, western/central
MD, and northern VA), but continued destabilization resulting from
the loss of daytime heat should temper overall storm strength.

Farther north (across eastern PA), more organized portion of the
line continues eastward with the leading edge of the convection
coincident with the storm outflow. Surface observations at MUI and
MDT recently reported gusts of 38 and 42 kt, respectively. Surface
observations at SEG also reported a gust of 34 kt. These gusts are
lower than those experienced across portions of central PA and a
general downward trend in storm strength is expected to continue.

..Mosier.. 08/20/2017

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

ATTN...WFO...PHI...BGM...CTP...LWX...PBZ...RLX...

LAT...LON   39388084 39787833 40277732 41567681 42017622 41807540
            40557526 39057695 38717999 39388084




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