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