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ACUS11 KWNS 170859
SPC MCD 170859

Mesoscale Discussion 0125
NWS Storm Prediction Center Norman OK
0359 AM CDT Sat Mar 17 2018

Areas affected...Chicagoland...Northern/East-Central
IN...West-Central/South-Central OH

Concerning...Winter mixed precipitation

Valid 170859Z - 171300Z

SUMMARY...Mixed winter precipitation is possible over portions of
the OH Valley this morning.

DISCUSSION...Regional radar imagery shows a band of precipitation
arcing from northern IL into southwest/south-central OH. This area
of precipitation is expected to gradually shift eastward over the
next several hours as the shortwave trough responsible for the
ongoing warm-air advection progresses through the OH Valley. Surface
observations show that mixed winter precipitation exists from
Chicagoland region into adjacent northwest IN. A transition to
freezing rain is also anticipated across central IN soon. However,
in these areas, precipitation will likely erode from southwest to
northeast over the next hour or two as the dry slot associated with
the shortwave trough continues to push into the region.

Farther southwest (across east-central IN and west-central/
south-central OH), precipitation rates are expected to increase over
the next hour or so with a predominant precipitation type of
freezing rain. This precipitation is generally expected to be light
but freezing rain rates may briefly exceeded 0.05"/hr within the
heavier cores.

..Mosier.. 03/17/2018

...Please see for graphic product...


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