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ACUS11 KWNS 110105
SWOMCD
SPC MCD 110104=20
MIZ000-WIZ000-MNZ000-110700-

Mesoscale Discussion 1989
NWS Storm Prediction Center Norman OK
0704 PM CST Fri Dec 10 2021

Areas affected...portions of southern Minnesota into northern
Wisconsin

Concerning...Heavy snow=20

Valid 110104Z - 110700Z

SUMMARY...1-2 inch/hr snowfall rates are expected in the heavier
snow bands across southern Minnesota into northern Wisconsin for the
next several hours.

DISCUSSION...A surface low centered across northwest MO continues to
track northeast in tandem with a positively-tilted mid-level trough
and upper-level jet streak, promoting widespread deep-layer ascent
across the Upper Mississippi Valley. Deep low to mid-level moisture
continues to advect north-northwestward within a warm-conveyer belt,
evident via widespread ongoing rain/wintry precipitation, which is
wrapping around the northern periphery of the low across central
MN/WI. The deep moisture continues to ascend via strong 925-700 mb
WAA while pivoting northwestward around the low, where 00Z
mesoanalysis depicts strong 700 mb frontogenesis. In the 700 mb
frontogenesis zone, near-saturated to saturated air is expected to
continue rapidly ascending within a deep, sub-freezing tropospheric
layer, where heavy snow has already been reported. As such, 1-2
inch/hr snowfall rates will likely continue across portions of
central MN into WI for several more hours.

..Squitieri/Grams.. 12/11/2021

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!vS7BflbjHTJgwbN68G-W7u_v_3LGoUWcvt75Y3bFPqRImslna2vNLMV2Uhxf_UaVDrmBOUhT$=
for graphic product...

ATTN...WFO...MQT...GRB...DLH...ARX...MPX...FSD...

LAT...LON 43799569 44369512 45319401 46059205 46078938 45798823
45328760 45028745 44798847 44628910 44349000 44219093
43999322 43699497 43669535 43799569=20



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