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ACUS11 KWNS 142302
SPC MCD 142302

Mesoscale Discussion 0258
NWS Storm Prediction Center Norman OK
0602 PM CDT Sat Apr 14 2018

Areas affected...Central/eastern Minnesota eastward into Wisconsin

Concerning...Heavy snow

Valid 142302Z - 150500Z

SUMMARY...Areas of moderate to heavy snow will gradually shift
eastward into central Wisconsin over the next few hours.  Closer to
the WI/IL border, sleet and freezing rain will be the primary
precipitation type.

DISCUSSION...Bands of moderate to heavy snow continue from near the
Minneapolis area into western Wisconsin currently.  Additionally,
radar mosaic, water vapor imagery, and objective analyses indicate
an expanding area of precipitation across Illinois - likely tied to
a developing warm conveyor just east of a cut-off mid-level low
centered over northeastern Kansas.  At the surface, cold advection
continues across the discussion area on the northeastern periphery
of a surface low near southern Iowa.  Surface temperatures were in
the low- to mid-20s F in Minnesota and central Wisconsin, with low
30s temperatures noted in southern Wisconsin.

With time, models and observations suggest an expansion of ongoing
areas of snow into central Wisconsin, with localized rates exceeding
1 inch per hour.  Farther south closer to the freezing line (along
the WI/IL border area and into southeastern Wisconsin), showers of
freezing rain and sleet are more likely, which will result in
accumulations on exposed surfaces.  Furthermore, elevated buoyancy
(resulting from steep mid-level lapse rates across the region) may
result in areas of thunder in addition to convectively enhanced
precipitation rates.

..Cook.. 04/14/2018

...Please see for graphic product...


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