ZCZC SPCSWOMCD ALL
ACUS11 KWNS 270613 
SPC MCD 270613 
OKZ000-270815-

Mesoscale Discussion 1908
NWS Storm Prediction Center Norman OK
0113 AM CDT Wed Oct 27 2021

Areas affected...Parts of central into eastern Oklahoma

Concerning...Severe Thunderstorm Watch 538...

Valid 270613Z - 270815Z

The severe weather threat for Severe Thunderstorm Watch 538
continues.

SUMMARY...Localized severe wind gusts with the potential for an
isolated tornado may continue another or or so, before tending to
diminish as the squall line advances east of the watch by 08-09Z.

DISCUSSION...A northeastward surging segment of the squall line has
crossed the Interstate 35 corridor of central Oklahoma with mostly
sub-severe wind gusts recorded in ASOS and mesonet observations, but
with a number of embedded cyclonic circulations evident along the
leading edge of the surface cold pool.  Low-level vertical shear is
strong eastward through much of the remainder of Oklahoma, beneath a
50 kt southerly 850 mb jet.  However, the squall line is in the
process of progressing across and east of a surface warm front, with
a substantive near surface stable layer persisting to the northeast
of the front.  With continued eastward progression, even potential
for localized severe wind gusts and/or an isolated tornado, seems
likely to diminish within the next few hours.

..Kerr.. 10/27/2021

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

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

LAT...LON   36809696 36859598 36259553 35579531 34379553 33859619
            34139685 34829694 35399685 36219718 36649734 36809696 

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