SPC MD 1493

MD 1493 CONCERNING SEVERE THUNDERSTORM WATCH 438... FOR NORTHERN KANSAS AND SOUTHERN NEBRASKA

Mesoscale Discussion 1493
NWS Storm Prediction Center Norman OK
0617 PM CDT Fri Aug 14 2020

Areas affected...Northern Kansas and southern Nebraska

Concerning...Severe Thunderstorm Watch 438...

Valid 142317Z - 150045Z

The severe weather threat for Severe Thunderstorm Watch 438
continues.

SUMMARY...Expect storms to continue to build southwestward along the
front this evening.

DISCUSSION...A large supercell has continued southward across
southeast Nebraska this evening with several reports of 1.25 inch
hail and a few brief tornado reports. Expect additional development
to continue on the western flank of the ongoing activity along the
cold front through the evening. The brief tornadoes are likely a
result of vorticity stretching along the cold front boundary where
extreme instability (4000-5000 J/kg MLCAPE) is resulting in extreme
low-level parcel accelerations. A threat for an additional brief
tornado or two remains possible for the next 2 hours before the
threat diminishes as the boundary layer cools. A lack of stronger
upper-level forcing should allow storm activity to gradually weaken
after sunset with most of the severe weather threat coming to an end
by 04-05Z.

..Bentley.. 08/14/2020

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

ATTN...WFO...OAX...TOP...ICT...GID...

LAT...LON   40199907 40679812 40849759 40989668 40579623 39939628
            39509688 39249781 39079852 39169913 39629938 40199907 

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