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ACUS11 KWNS 110426
SWOMCD
SPC MCD 110425=20
INZ000-ILZ000-110600-
Mesoscale Discussion 2002
NWS Storm Prediction Center Norman OK
1025 PM CST Fri Dec 10 2021
Areas affected...much of Indiana
Concerning...Tornado Watch 557...
Valid 110425Z - 110600Z
The severe weather threat for Tornado Watch 557 continues.
SUMMARY...The severe threat continues across Tornado Watch 557, and
may progress eastward across much of Indiana. Damaging gusts are
expected to be the main threat across northern into central Indiana,
with a couple of brief tornadoes possible across southern Indiana.
An additional Tornado Watch issuance may be needed in southern
Indiana.
DISCUSSION...A broken line of storms, including occasional embedded
supercells, persists across central and eastern parts of Tornado
Watch 557. Mainly strong/damaging gusts have been observed over the
past couple of hours, though a TDS (suggesting the presence of a
tornado) has recently been noted in Coles, County IL. Across
Indiana, a near saturated low-level airmass is in place, with
surface observations showing both temperatures and dewpoints in the
mid to upper 50s F in northern/central IN, with lower 60s F temperatures/dewpoints observed in southern IN.=20
Given the modest low-level temperatures and mid-level lapse rates,
buoyancy is currently poor across IN, with modest convective
inhibition in place. Since low-level airmass recovery is not
expected to be overly robust across northern/central IN,
near-surface based storms may support occasional strong to damaging
wind gusts. A relatively greater threat for damaging gusts and
perhaps a couple of tornadoes may develop farther south in southern
IN where the richer low-level moisture is in place. A downstream
Tornado Watch may be needed in southern IN.
..Squitieri/Grams.. 12/11/2021
...Please see
https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!sSIs8O6aJyjfSg1Tfa4hjB-aBuGu9xmrXuufWAYDQ5DZzcZIFLFElKZsWJEycQPYenpMy5HS$=
for graphic product...
ATTN...WFO...ILN...LMK...IWX...IND...LOT...ILX...
LAT...LON 38688735 40058754 40978735 41338701 41438673 41488650
41518625 41508576 41368548 40878502 40438490 39958495
39318502 38978516 38788608 38688735=20
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