ACUS11 KWNS 090259
SWOMCD
SPC MCD 090259=20
NDZ000-MTZ000-090900-

Mesoscale Discussion 2252
NWS Storm Prediction Center Norman OK
0859 PM CST Sun Dec 08 2024

Areas affected...Eastern Montana and far western North Dakota

Concerning...Blizzard=20

Valid 090259Z - 090900Z

SUMMARY...Sporadic blizzard conditions are likely through the
overnight hours across eastern Montana and into far western North
Dakota. Conditions are expected to deteriorate steadily between
06-12 UTC as light to moderate snow fall rates coincide with 30-35
mph winds.

DISCUSSION...Temperatures across eastern MT have been steadily
falling to below freezing as a cold front begins to push south into
the northern Plains. This has been promoting a change over from a
wintry mix to predominantly snow, which is expected to gradually
spread southeast through early Monday morning as a surface low
translates east along the international border. Sustained gradient
winds between 30-35 mph are being observed with gusts upwards of
40-45 mph. Blowing snow model output suggests that with light to
moderate snow fall rates (0.25-0.5 in/hour) and temperatures in the
low 30s, these sustained winds will result in sporadic/transient
blizzard conditions with more significant/widespread visibility
reductions likely where gusts exceed 40 mph. Early indications of
this trend have already been noted across northeast MT where
periodic visibility reductions down to 1/2 mile have been coincident
with gusts over 40 mph. Such conditions should become more common
across eastern MT/far western ND as the surface freezing line pushes
south and supports snow as the primary precipitation type. Recent
HRRR solutions suggest sporadic blizzard conditions will begin to
impact the I-94 corridor as early as 05-06 UTC.

..Moore.. 12/09/2024

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!9dHVTrjMREQJgAqAmQzDov1QOqpN9gBz6rf4NYBZ8nxWzITfBYoPU9TtjP1Njga0A9wyQEATF= l_POBCA55Z0b9wM2XE$ for graphic product...

ATTN...WFO...BIS...BYZ...GGW...

LAT...LON 48760638 48770564 48700492 48540444 47410350 46950331
46500343 46100377 45860421 45840482 45930550 46150620
46550671 46950713 47420737 47950743 48230730 48590696
48760638=20


=3D =3D =3D
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