SPC MD 1744

MD 1744 CONCERNING SEVERE THUNDERSTORM WATCH 500… FOR SOUTHWEST IOWA…FAR NEBRASKA…FAR NORTHWEST MISSOURI

MD 1744 Image


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 

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from SPC Mesoscale Discussions https://bit.ly/2GWmGR2

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