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ACUS11 KWNS 010818
SWOMCD
SPC MCD 010817
NEZ000-SDZ000-011415-
Mesoscale Discussion 1677
NWS Storm Prediction Center Norman OK
0217 AM CST Sat Dec 01 2018
Areas affected...Central NE into southern SD
Concerning...Heavy snow
Valid 010817Z - 011415Z
SUMMARY...Heavy snow, with rates potentially exceeding 1 inch/hour,
is expected to commence between 10-12Z.
DISCUSSION...At 08Z, a powerful deep-layer cyclone is moving
northeastward across the central Plains, with an expansive
precipitation shield arcing from the Arklatex/Ozarks vicinity
northwest into portions of KS/NE and southern SD. Surface
temperatures to the north of the cyclone have remained largely above
freezing and most of the precipitation has fallen as rain thus far.
However, gradual deep-layer cooling is expected through the morning
as the cyclone slows down and begins to occlude, with a changeover
to primarily snow expected within the MCD area between 10-12Z. As
this changeover occurs, strong ascent and continued deep-layer
moisture transport will support heavy wet snow rates at or above 1
inch per hour, which could persist for several hours through the
morning due to the slow movement of the cyclone.
..Dean.. 12/01/2018
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...FSD...OAX...ABR...GID...LBF...UNR...
LAT...LON 40729954 41280026 42390116 42970163 43200176 43560156
43710109 43750076 43509973 43159909 42189839 41619816
40849837 40689893 40729954
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