ACUS11 KWNS 221956
SWOMCD
SPC MCD 221955=20
SDZ000-NEZ000-NDZ000-MTZ000-WYZ000-230000-
Mesoscale Discussion 2064
NWS Storm Prediction Center Norman OK
0155 PM CST Thu Dec 22 2022
Areas affected...Far eastern Montana and southwest North Dakota into
South Dakota and far northern Nebraska
Concerning...Blizzard=20
Valid 221955Z - 230000Z
SUMMARY...Ground blizzard conditions will continue in open country
through at least 00 UTC before gradually diminishing into the late
evening hours. Longer duration blizzard conditions are expected
across parts of western to southern South Dakota where winds will
remain elevated.
DISCUSSION...Surface observations and regional web cameras from
eastern MT, southwest ND, and much of western and southern SD
continue to show persistent blizzard conditions with visibility
reductions near/below 1/4 mile - primarily across open country away
from terrain/urban sheltering. Nearly all of these observations are
within a broad swath of blowing snow evident in GOES Snow/Ice
imagery that extends from the MT/ND border southeastward into
eastern NE. Wind speeds over the past several hours have been
roughly 5-10 knots stronger than guidance, and are expected to
increase slightly over the next couple of hours before peaking
during the 22-00 UTC time frame. Consequently, widespread ground
blizzard conditions appear likely through at least 00 UTC before
gradually diminishing through the evening hours. If the noted low
bias in wind guidance persists, the spatial contraction of blizzard
conditions may be slower than currently depicted by most model
solutions. Blizzard conditions will likely persist the longest
across parts of western to southern SD where winds above 25 knots
are probable through roughly 02 UTC and will support scattered to
widespread visibility reductions to near 1/4 mile per blowing snow
model output.
..Moore.. 12/22/2022
...Please see
https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!-XhFROqHoeunUTnTC6KsQXBdIb2cEXl1_QxZAXrXihIX8c2LrP8BIIkrJsUveeQX75cqHsLRH= hu6lOtMz-acV_cRqcM$ for graphic product...
ATTN...WFO...FSD...OAX...ABR...BIS...LBF...UNR...BYZ...GGW...
LAT...LON 42440053 43750215 44480327 44960428 46210466 47110471
47970453 48170399 47990332 46800135 46110042 44109745
43679725 43189756 42749821 42539913 42349984 42440053=20
=3D =3D =3D
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