MD 1744 CONCERNING SEVERE THUNDERSTORM WATCH 500… FOR SOUTHWEST IOWA…FAR NEBRASKA…FAR NORTHWEST MISSOURI
Mesoscale Discussion 1744 NWS Storm Prediction Center Norman OK 1128 PM CDT Sun Oct 11 2020 Areas affected...Southwest Iowa...Far Nebraska...Far Northwest Missouri Concerning...Severe Thunderstorm Watch 500... Valid 120428Z - 120600Z The severe weather threat for Severe Thunderstorm Watch 500 continues. SUMMARY...An isolated wind damage threat is expected to persist across southwest Iowa and far northwest Missouri for another one to two hours. Weather watch issuance is unlikely beyond the expiration of Ww 500. DISCUSSION...A line of strong to severe thunderstorms is ongoing across western Iowa extending south-southwestward into far southeast Nebraska. The RAP has weak instability ahead of the line with MLCAPE of 500 to 1000 J/kg. This combined with strengthening low-level flow will support continued thunderstorm development over the next few hours. The Des Moines WSR-88D VWP currently has 60 kt of 0-6 km shear which will be enough to continue an isolated severe threat a little while longer with the stronger cells embedded in the line. A few damaging wind gusts will be possible along the leading edge of the line as it moves eastward across southwest Iowa and far northwest Missouri. However, as instability continues to weaken during the early overnight period, the severe threat will become increasingly marginal. ..Broyles.. 10/12/2020 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...DMX...EAX...OAX...TOP... LAT...LON 42469435 42369485 42059510 41079543 40319581 39979575 39869556 39819505 40029457 41049423 42059394 42469435
from SPC Mesoscale Discussions https://bit.ly/2GWmGR2
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