SPC MD 1781



MD 1781 CONCERNING SEVERE THUNDERSTORM WATCH 504… FOR NORTHEASTERN MISSOURI AND WESTERN/NORTHERN ILLINOIS

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Mesoscale Discussion 1781
NWS Storm Prediction Center Norman OK
0148 PM CST Tue Nov 10 2020

Areas affected...northeastern Missouri and western/northern Illinois

Concerning...Severe Thunderstorm Watch 504...

Valid 101948Z - 102115Z

The severe weather threat for Severe Thunderstorm Watch 504
continues.

SUMMARY...The severe threat continues across WW 504.

DISCUSSION...A fast-moving line of convection has evolved from near
MLI to UIN to JEF over the past couple of hours.  Strong to severe
wind gusts were reported in the past hour at Columbia (44 kts) and
Jefferson City (47 kts) with the passage of the convection.  The
storms remain in a strongly sheared environment, with low-level
shear expected to gradually strengthen in tandem with a developing
low over eastern Iowa.  With a general motion of 45-60 knots, the
line is expected to reach northeastern portions of the WW (across
north-central Illinois) around 21Z or so and central Illinois
between 21Z and 22Z.  It is possible that a brief tornado threat
will increase through that time frame as well.

..Cook.. 11/10/2020

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

ATTN...WFO...LOT...ILX...MKX...LSX...DVN...ARX...

LAT...LON   41379153 41609152 41989125 42399088 42589052 42608989
            42408947 41868911 41278876 40698855 40208878 39698935
            39079008 38629081 38459156 38479199 38719214 39449201
            40239171 41379153 

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