Mesoscale Discussion 0032
NWS Storm Prediction Center Norman OK
0307 PM CST Wed Jan 11 2017
Areas affected...Southern WI and far northwestern IL
Concerning...Winter mixed precipitation
Valid 112107Z - 120100Z
SUMMARY...A mix of freezing rain, sleet, and snow is anticipated
over the next few hours across portions of southern WI and far
northwestern IL. Freezing rain rates could briefly approach 0.05
inch per hour with transient snowfall rates near 1 inch per hour
also possible farther north of the transition zone.
DISCUSSION...Recent surface analysis places a cold front from near
the easternmost WI/IL border southwestward through central MO and
into southeastern KS. Southwesterly flow aloft continues above this
frontal zone, with the resulting isentropic lift supporting the
development of precipitation across eastern IA, southern WI, and
northwestern IL. This process is expected to continue, with the
light precipitation acting to moisten the mid-level dry layer noted
on recent RAP forecast soundings. Once this dry layer is overcome,
more substantial precipitation will begin to reach the surface, with
profiles across southern portions of the area currently supporting a
mix of freezing rain and sleet. Freezing rain rates may briefly
exceed 0.05 inch per hour. Farther north, colder profiles will
result in snow as the primary precipitation type, with snowfall
rates briefly exceeding one inch per hour possible.
..Mosier.. 01/11/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...GRB...MKX...DVN...ARX...
LAT...LON 43378780 43028819 42648929 42349032 42499066 42999079
43918977 44688749 43948769 43378780
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