Subj : MESO: Mesoscale Discussion 1950
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Sat Nov 12 2022 09:31:28

ACUS11 KWNS 120931
SWOMCD
SPC MCD 120930=20
INZ000-ILZ000-121300-

Mesoscale Discussion 1950
NWS Storm Prediction Center Norman OK
0330 AM CST Sat Nov 12 2022

Areas affected...south-central IL...west-central IN

Concerning...Heavy snow=20

Valid 120930Z - 121300Z

SUMMARY...Heavy snowfall rates (near 1 inch/hour for 1 to 2 hours)
are expected in a frontogenetic band centered around 650 mb near the
I-70 corridor through 13 UTC.

DISCUSSION...Radar mosaic shows a band of moderate to heavy snow
located from Belleville, IL extending east-northeast to Mattoon, IL
as of 0930 UTC.  Scott AFB in Belleville, IL measured a 1.25
inch/hour rate between 0730-0830 UTC and heavy snow (1/8 mi
visibility) was reported through 0855 UTC.  The 06 UTC NAM appears
to be capturing the placement of the snowfall band with
frontogenesis in the 600-700 mb layer.  The frontogenetic
contribution and the large-scale ascent (DCVA) provided by the
approach of the mid-level shortwave trough over the MO Ozarks will
combine to enhance ascent and boost snowfall rates in a mesoscale
corridor (near I-70).  The NAM shifts the frontogenetic forcing into
west-central IN during the 1100-1300 UTC period and the rates will
coincidentally taper over IL.

...Smith.. 11/12/2022

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!6f1aGyCZDr2q3KJtEsHogF9n9c1WQ0_Wuw5bCA3w7zd-08NwDHMM18iqYv6Q0J5cn_Mbzu0fv=
XDTzgn4Bi4fZ-ej1fI$  for graphic product...

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

LAT...LON   38529012 39228929 39768714 39688662 39388648 39218683
            39148782 38888870 38378952 38378987 38529012=20


=3D =3D =3D
To unsubscribe from WX-STORM and you already have a login, go to
https://lists.illinois.edu and use the "Unsubscribe" link.  Otherwise email
Chris Novy at cnovy@cox.net and ask to be removed from WX-STORM.

--- SBBSecho 3.14-Linux
 * Origin: capitolcityonline.net * Telnet/SSH:2022/HTTP (1:2320/105)

.