Subj : MESO: Mesoscale Discussion 0261
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Thu Mar 09 2023 14:42:45

ACUS11 KWNS 091442
SWOMCD
SPC MCD 091442=20
IAZ000-WIZ000-MNZ000-091845-

Mesoscale Discussion 0261
NWS Storm Prediction Center Norman OK
0842 AM CST Thu Mar 09 2023

Areas affected...portions of northeast Iowa into far southwest
Wisconsin

Concerning...Heavy snow=20

Valid 091442Z - 091845Z

SUMMARY...Brief bouts of 1 inch/hr snowfall rates are possible with
an intensifying band of snow within a warm-air advection regime.
Periods of reduced visibility may accompany the heavier bands,
promoting potentially hazardous travel conditions.

DISCUSSION...A band of moderate to heavy snow continues to intensify
across central IA while progressing east-northeast toward the Great
Lakes region. The approach of a 500 mb trough, overspread by the
right-front quadrant of a 100+ kt 300 mb jet streak, is prompting a
low-level mass response in the form of modest 925-700 mb warm-air
advection. This warm-air advection is resulting in both increased
lift and moisture within sub-freezing lower-tropospheric profiles.
Though 14Z mesoanalysis does not show a widespread saturated -14 to
-17C dendritic growth zone, the moisture advection ahead of the
ongoing snow band, along with the deep-layer, synoptic-scale ascent,
may still support occasional periods of 1 inch/hr snowfall rates. It
is unclear how far east these rates will persist into the afternoon,
given mixed signals from high-resolution guidance. Nonetheless,
current regional/MRMS radar imagery and available webcams in the
vicinity of I-35 and I-80 suggest that heavy snow is in progress
(with associated hazardous travel conditions) and these conditions
should continue for at least the next few hours.

...Squitieri.. 03/09/2023

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!9bccpdbX4xwABe07nO-ub7k5Cq3C45X_ZyJJj5DY56AdOG_L6Xznc_-4cYMDhxYozhp9Lp6xu=
uWNni4hLCo6a-pGy3Q$  for graphic product...

ATTN...WFO...DVN...ARX...DMX...

LAT...LON   42209341 43039284 43409229 43619162 43649100 43559064
            43299043 43109043 42609055 42149099 41999154 41869243
            41889290 42209341=20


=3D =3D =3D
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