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ACUS11 KWNS 110103
SWOMCD
SPC MCD 110102=20
ILZ000-MOZ000-110200-

Mesoscale Discussion 1988
NWS Storm Prediction Center Norman OK
0702 PM CST Fri Dec 10 2021

Areas affected...Eastern Missouri and western Illinois

Concerning...Tornado Watch 553...

Valid 110102Z - 110200Z

The severe weather threat for Tornado Watch 553 continues.

SUMMARY...The damaging wind and tornado threat is increasing across
eastern Missouri and western Illinois, including the St. Louis Metro
area.

DISCUSSION...A line of storms has organized across central Missouri
and is moving quickly east toward the Mississippi River. Within this
line are several embedded supercells with some low-level rotation
evident from the KLSX WSR-88D. The storm with the coldest cloud tops
is currently moving toward St. Louis. Therefore, this portion of the
line in particular may have a greater severe wind/tornado threat
over the next 1 to 2 hours, especially given the backed surface flow
and around 500 m2/s2 0-1 km SRH from the KLSX VWP.

..Bentley.. 12/11/2021

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!sf4GsZgadqDXVYdoFY1yJ5CbKoWyi2aZjSwWoB2jfnmCgF0sFrQBSnfofjig6rLdUrpvSHMY$=
for graphic product...

ATTN...WFO...PAH...ILX...LSX...SGF...

LAT...LON 39609124 39779070 39598994 38498949 37788974 37409094
37259193 37439234 38989191 39459149 39609124=20



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