Another day of average temperatures with highs in the upper 30s and low 40s is in store Sunday. For western Upper Michigan, light lake effect snow showers are expected to come to an end as those gusty northwest winds eventually turn westerly and relax for a few brief hours during the afternoon. In the eastern U.P. leftover rain/snow showers also wrap up by mid/late afternoon.
We've been watching this blast of arctic high pressure that is forecast to sink down out of Canada and sweep across the Great Lakes for a few days now. We still expect below average temperatures and gusty northwest winds to mix into Upper Michigan from Sunday night into the first half of next week. Overnight lows will fall into the teens in the coolest sections of the western interior both Monday and Tuesday. Daytime high temperatures will struggle to break out of the 20s during this time as well.
There will also be some modest snow accumulation in the northwest wind belts of west/central Upper Michigan Monday and Tuesday. However, the highest snowfall totals, aided by those gusty northwest winds off the lake will be measured across the northeastern portions of the Upper Peninsula. A Lake Effect Snow Watch will be effective for Alger and northern Schoolcraft Counties from Monday morning through Tuesday morning. Accumulating lake effect snow and northwest winds gusting to 30-40 MPH near the southern shore of Lake Superior will create blowing snow and reduced visibility.
Very dry air associated with that strong high pressure ridge will bring mainly sunny and dry conditions Tuesday evening. By Wednesday we can expect temperatures to rebound to near seasonal with daytime highs in the upper 30s/low 40s.