Subj : MESO: Mesoscale Discussion 1661
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Fri Jul 21 2023 09:20:22

ACUS11 KWNS 210920
SWOMCD
SPC MCD 210919=20
ARZ000-MOZ000-OKZ000-211045-

Mesoscale Discussion 1661
NWS Storm Prediction Center Norman OK
0419 AM CDT Fri Jul 21 2023

Areas affected...North-Central/Northeast OK...Far Northwest
AR...Extreme Southwest MO

Concerning...Severe Thunderstorm Watch 531...

Valid 210919Z - 211045Z

The severe weather threat for Severe Thunderstorm Watch 531
continues.

SUMMARY...Damaging wind gusts will likely continue as the line
progresses through northeast OK. A new watch will be needed by 10Z.

DISCUSSION...Surface observation at END recently reported a 73 kt
gust as the well-organized convective line move through. This gust
is consistent with recent radar data indicating outbound velocities
approaching 80 kt around 2 kft.  Echo tops have also recently
increased as a pair of stronger updrafts developed within the line.
This increase in intensity may be a result of favorable warm-air
advection associated with the east-west frontal zone extended across
OK and/or modestly increased buoyancy resulting from more low-level
moisture. Given these recent trends, expectation is for the damaging
wind threat to extend into more of northeastern OK, and perhaps
extreme southwest MO/far northwest AR, with a downstream watch
likely needed before 10Z.

...Mosier/Guyer.. 07/21/2023

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!9pqaDlDilZxNnOjqU-4-yEoYkt76-ke-bfvG5Ovnc9xme-8fTaIHIXHkel5M-7lg1Q-cD4Ls3=
_pGhhVGeEWFZ1yG-PM$  for graphic product...

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

LAT...LON   36989832 36749432 35299421 35499678 35949869 36989832=20


=3D =3D =3D
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