ACUS11 KWNS 021151
SWOMCD
SPC MCD 021150
IAZ000-021445-

Mesoscale Discussion 0001
NWS Storm Prediction Center Norman OK
0550 AM CST Thu Jan 02 2025

Areas affected...South-central IA

Concerning...Heavy snow

Valid 021150Z - 021445Z

SUMMARY...A focused burst of moderate to heavy snow should continue
to impact the I-80 corridor and overspread the I-35 corridor in the south-central Iowa vicinity through mid-morning. Rates near 1 inch
per hour may occur within a narrow portion of the band into parts of
the Des Moines Metro Area.

DISCUSSION...Ahead of a low-amplitude shortwave impulse progressing
across the Mid-MO Valley, a focused corridor of frontogenetic
forcing for ascent has yield a comma-shaped snow band across parts
of west-central to southwest IA. Multiple observations have reported
1/4 to 1/2 mile visibility, albeit briefly, generally along and
north of I-80. Early-morning guidance suggests frontogenesis will
subside towards late morning, with recent HRRR runs indicating a
loss of comma-head shape into more of a west/east-oriented band as
this occurs. While snow rates around 1 in/hr should peak through
15Z, more moderate snow rates near 0.5 in/hr may linger into midday.

..Grams.. 01/02/2025

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

LAT...LON 42059457 42159369 41989236 41659200 41209213 40919278
40879394 41059479 41279498 41729475 42059457

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