SPC MD 492

MD 0492 CONCERNING SEVERE THUNDERSTORM WATCH 151... FOR SOUTHWEST THROUGH CENTRAL OKLAHOMA

Mesoscale Discussion 0492
NWS Storm Prediction Center Norman OK
0702 PM CDT Tue Apr 28 2020

Areas affected...southwest through central Oklahoma

Concerning...Severe Thunderstorm Watch 151...

Valid 290002Z - 290130Z

The severe weather threat for Severe Thunderstorm Watch 151
continues.

SUMMARY...Threat for very large hail and locally strong to damaging
wind gusts will persist through mid evening from southwest through
central OK.

DISCUSSION...Early this evening isolated severe storms including
some with supercell structures continue developing across central OK
along a southeast-advancing cold front. The atmosphere is very
unstable in this region with 3000-3500 J/kg MLCAPE along with steep
lapse rates and 35-40 kt effective bulk shear. These storms have a
history of very large hail and damaging gusts. Despite the increase
in convective inhibition due to boundary-layer cooling, forcing from
near the front/dryline intersection over southwest OK and northeast
along the cold front will remain sufficient for thunderstorm
development through at least mid evening.

..Dial.. 04/29/2020

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

ATTN...WFO...FWD...OUN...

LAT...LON   34429867 35299786 35739733 35669677 34929652 34169674
            33909807 34429867 

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