Mesoscale Discussion 0345
NWS Storm Prediction Center Norman OK
0314 PM CDT Fri Apr 09 2021
Areas affected...central and eastern Oklahoma/western Arkansas/North
Texas
Concerning...Severe potential...Watch likely
Valid 092014Z - 092115Z
Probability of Watch Issuance...80 percent
SUMMARY...Eventual storm development expected across this region
will likely require WW issuance late this afternoon.
DISCUSSION...Midday RAOB from KOKC revealed stout capping just above
850 mb, supporting persistent low cloud cover across central
Oklahoma. While the low clouds persist, a slight change in
character toward more cumuliform elements is occurring --
particularly over portions of western/southwestern Oklahoma.
As a cold front continues to advance southeastward across this area,
ahead of a mid-level vort max shifting southeastward out of the High
Plains, ascent will continue to allow the cap to weaken -- resulting
in eventual storm development. Intensity of the initial cells over
far western Oklahoma will likely remain limited, but with 2000 J/kg
mixed-layer CAPE now indicated within the very steep lapse rates
within the elevated mixed layer above the cap, robust storms will
likely evolve.
Storm intensity will be aided by a belt of stronger mid-level flow
expected to spread across the region south/southeast of the upper
system. Along with potential for locally damaging wind gusts, very
large hail will also be possible with the strongest/rotating storms.
..Goss/Thompson.. 04/09/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LZK...SGF...SHV...TSA...ICT...FWD...OUN...
LAT...LON 35389873 36389838 37019704 37019488 36089383 34429374
33199511 33479796 34439850 35389873