Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 190449
SWOMCD
SPC MCD 190448
MOZ000-ARZ000-OKZ000-190545-

Mesoscale Discussion 0773
NWS Storm Prediction Center Norman OK
1148 PM CDT Thu May 18 2017

Areas affected...northwest AR and southwest MO

Concerning...Tornado Watch 243...

Valid 190448Z - 190545Z

The severe weather threat for Tornado Watch 243 continues.

SUMMARY...Scattered 60-100 mph winds via either straight-line wind
swaths or weak tornadoes are expected to continue for at least the
next hour.

DISCUSSION...Radar mosaic shows a mature/severe bow across far
eastern OK with another bowing segment over southwest MO.  The bow
is moving east-northeast around 50-kt.  The OK mesonet station in
Porter, OK measured an 86 mph gust at 0340Z with other observing
sites 65-70 mph.  Expecting the straight-line wind threat to
continue given a moist boundary layer with dewpoints in the upper
60s ahead of the bow.  Weak/brief tornadoes or tornado-like damage
from the stronger transient eddies in the line are also possible but
mainly across far northwest AR and near the MO border.

..Smith.. 05/19/2017

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

ATTN...WFO...LZK...SGF...TSA...

LAT...LON   36469476 36999431 37169319 36739263 36049304 35659364
            35519455 36469476




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