Mesoscale Discussion 0776
   NWS Storm Prediction Center Norman OK
   0546 PM CDT Sun May 15 2022

   Areas affected...South-central into east-central/southeast OK

   Concerning...Severe Thunderstorm Watch 221...

   Valid 152246Z - 160015Z

   The severe weather threat for Severe Thunderstorm Watch 221
   continues.

   SUMMARY...Storms moving southward across east-central OK will pose a
   threat for isolated very large hail through 00Z. One or more
   clusters may develop with time, which would pose an increased
   damaging wind risk.

   DISCUSSION...Multiple discrete supercells have developed along a
   southward-moving outflow boundary near the I-40 corridor of eastern
   OK. The thermodynamic environment is quite favorable for hail, with
   steep midlevel lapse rates and strong buoyancy noted on 18Z OUN/LZK
   soundings and recent objective mesoanalyses. 2.5" diameter hail was
   recently reported in Okfuskee County, and very large hail will
   continue to be possible with any sustained discrete cells into the
   evening. Deep-layer shear will remain sufficient for supercells, and
   a tornado or two cannot be ruled out, as long as cells remain rooted
   near the outflow boundary. Locally severe wind gusts will also be
   possible with these supercells. 

   With time, additional development is possible within a growing
   cumulus field to the southwest that extends into Garvin County. Some
   upscale growth is possible with time due to storm mergers and
   consolidating outflows, which could potentially pose an increasing
   severe-wind risk as convection spreads into south-central/southeast
   OK.

   ..Dean.. 05/15/2022

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

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

   LAT...LON   35459704 35629578 35629489 35609466 35399447 34519471
               34289596 34169717 35199717 35459704