SPC MD 1677


MD 1677 Image

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...


LAT...LON   40729954 41280026 42390116 42970163 43200176 43560156
            43710109 43750076 43509973 43159909 42189839 41619816
            40849837 40689893 40729954 

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