000
ACUS11 KWNS 170255
SWOMCD
SPC MCD 170255
MOZ000-ARZ000-OKZ000-170430-

Mesoscale Discussion 1513
NWS Storm Prediction Center Norman OK
0955 PM CDT Wed Aug 16 2017

Areas affected...Southwest into northeast OK...Far southwest
MO...Northwest AR

Concerning...Severe Thunderstorm Watch 453...

Valid 170255Z - 170430Z

The severe weather threat for Severe Thunderstorm Watch 453
continues.

SUMMARY...A lingering damaging wind risk continues with the line of
thunderstorms moving into the I-44 corridor, but the severe threat
should diminish with time late tonight.

DISCUSSION...The persistent band of thunderstorms that developed
earlier across KS/OK is moving steadily southeastward this evening,
with the strongest convection noted across portions of southwest
into central OK as of 0245Z. Outflow has advanced several miles
ahead of the primary convection across most of the band, though
stronger cells are noted near boundary inflections to the west and
northeast of the OKC metro. This band earlier produced several
measured severe wind gusts across northern OK, and some
damaging-wind risk will continue for the next 1-2 hours, especially
in areas where convection remains rooted near the composite outflow.

A gradual decreasing trend is expected with time late tonight, as
SBCINH increases and convection moves southeastward into a
less-sheared environment. The extended expiration time of 05Z for WW
453 should be sufficient to cover most of the remaining severe
threat across OK. Convection will also spread further east into
southwest MO and northwest AR with time, but weaker instability in
this area should limit the severe threat.

..Dean.. 08/17/2017

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

ATTN...WFO...SGF...TSA...OUN...

LAT...LON   34859980 35909732 36579589 36929461 37019354 36369351
            35939442 35359559 34749688 34429770 34279840 34299878
            34529929 34859980