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ACUS11 KWNS 110337
SWOMCD
SPC MCD 110336=20
INZ000-ILZ000-110430-

Mesoscale Discussion 1997
NWS Storm Prediction Center Norman OK
0936 PM CST Fri Dec 10 2021

Areas affected...portions of central Illinois

Concerning...Tornado Watch 557...

Valid 110336Z - 110430Z

The severe weather threat for Tornado Watch 557 continues.

SUMMARY...A strong tornado threat is expected to persist for the
next 1 to 2 hours across central and east-central Illinois.

DISCUSSION...The supercell on the southern edge of a line of storms
moving across central Illinois has produced several tornado debris
signatures so far. This portion of the line will remain the favored
location for tornadoes given the lack of storm interference, low to
mid 60s dewpoints, and very strong low-level shear (0-1 km SRH in
excess of 600 m2/s2 per both ILX and VWX VWP). In addition, this
environment will support the potential for strong tornadoes,
especially as the storm inflow remains uninhibited.

..Bentley.. 12/11/2021

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!ukmpqm44aHh4f4DIBw2_ArwD58SaSx4Jb-huzAAmEAVwa5baCoOeDhGql-ojFNBEC8DXzbAX$=
for graphic product...

ATTN...WFO...IND...ILX...LSX...

LAT...LON 38998882 39058900 39278918 39618877 39768734 39538700
39198730 39048834 38998882=20



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