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ACUS11 KWNS 282341
SWOMCD
SPC MCD 282340=20
MIZ000-WIZ000-MNZ000-290345-

Mesoscale Discussion 2069
NWS Storm Prediction Center Norman OK
0540 PM CST Tue Dec 28 2021

Areas affected...Northern Wisconsin into northeast Minnesota

Concerning...Heavy snow=20

Valid 282340Z - 290345Z

SUMMARY...Snow banding is probable over the next few hours across
northern Wisconsin into northeast Minnesota. Moderate to heavy
snowfall rates up to 1 inch/hour are possible. Lake-enhanced
snowfall is also likely along the North Shore of MN.

DISCUSSION...Regional radar mosaics over the past hour have shown a
gradual weakening of the stratiform precipitation over
central/southern WI with a corresponding increase across northern
portions of the state into northeast MN. Surface observations under
this precipitation show occasional visibility reductions to 1/2 to
1/4 mile. This uptick in snowfall is likely the result of increasing
ascent ahead of an approaching vorticity maxima (noted in
water-vapor and radar imagery over south-central MN), as well as
more focused ascent within a swath of warm air advection between
850-700 mb. Forecast soundings from northeast MN show a gradual
deepening of the dentritic growth zone in the coming hours with much
of this layer residing within a favorable zone of lift.
Additionally, transient frontogenesis may further augment and
organize mesoscale ascent. The combined result will be the potential
for at least a loosely organized snow band that will support
moderate to heavy snowfall rates up to 1 inch/hour. With Lake
Superior surface temperatures in the upper 30s/low 40s and
east/southeast winds, lake-effect enhancement is likely along the
North Shore where heavier snowfall rates are probable.

..Moore.. 12/28/2021

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!ocUmW5knIilxcsMcXwaxZCDMsietgEr7xw_hPJ-gpyAjmuiyrnOrpP_iMlPyxvSzLTqat2zz$=
for graphic product...

ATTN...WFO...MQT...GRB...DLH...

LAT...LON 45929216 46569336 47059405 47729413 48159370 48449288
48339173 47969071 47439018 46668977 46298982 46019005
45789052 45749124 45929216=20



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