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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