ACUS11 KWNS 252131
SWOMCD
SPC MCD 252131=20
MNZ000-SDZ000-NDZ000-NEZ000-260130-

Mesoscale Discussion 2346
NWS Storm Prediction Center Norman OK
0331 PM CST Mon Dec 25 2023

Areas affected...Portions of South-Central North Dakota...central
and eastern South Dakota...and North Central Nebraska

Concerning...Heavy snow=20

Valid 252131Z - 260130Z

SUMMARY...Moderate to heavy snow possible this evening, with
blizzard conditions at times from south-central North Dakota
southward into central South Dakota and north-central Nebraska.

DISCUSSION...A deep surface low located across western Iowa has
begun to occlude this afternoon while bringing warm and moist air
across Iowa and Minnesota into the Dakotas. Aloft, a mid-level low
is stacked back to the southwest with very cold air being funneled
in by strong northwesterly flow across the High Plains into the
Central Plains. Areas of moderate to heavy snow have been ongoing
across eastern Nebraska and eastern South Dakota, with a transition
to accumulating ice/freezing rain to the northeast.=20

Due to the strength of the surface low, background flow has
increased with the strong mass response with surface winds sustained
at 25-30 mph gusting as high as 40-50 mph. Blizzard conditions have
been observed across central South Dakota with visibility around 1/4
mi and sustained winds at 20-30 mph gusting up to 50 mph. As the
surface low shifts back westward through the evening, strengthening
mid-level flow around 40-50 kts will overspread portions of the
Dakotas into western Nebraska. Warm air overspreading eastern North
Dakota into northeastern South Dakota will lead to a transition from
snow to freezing rain with potential for ice accumulations. The
increased upper-level support across the Dakotas into far northern
Nebraska will aid in formation of snow bands capable of 1"+/hr rates
along with potential for blowing snow and reduced visibility below
1/4 mi with continued strong surface winds. These conditions will
continue to spread westward as the low shifts west through the late
evening and overnight.

..Thornton/Hart.. 12/25/2023

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!98BQdmIA12HjRHAfqeikYrKm-cUqiz-3UgfIs-TwQdoPdhb80w90qRU7LspNqhSG8bjsv8zZo= 48vAXOWYJ2qyMrlvh4$ for graphic product...

ATTN...WFO...FGF...FSD...ABR...BIS...LBF...UNR...

LAT...LON 42480106 43430210 43880217 44520205 45310195 45890125
46919946 47049925 47499717 46689638 46029630 44159761
43679792 43159838 42649882 42239942 42209951 42160028
42480106=20


=3D =3D =3D
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