Steady west-northwest winds and lingering low level moisture keep heavy snow over the Keweenaw Peninsula today (Friday). During the daylight hours, the heaviest snowfall is expected to occur over north/central Houghton County with an additional 3-5?? of new snow. In addition, persistent winds gusting to 20-30 MPH will lead to reduced visibility and hazardous driving conditions. Lake effect snow showers will continue through early Sunday across much of the Keweenaw Peninsula. Total snow accumulation in the Keweenaw of more than a foot seems likely through early Sunday. Snowfall rates of an inch per hour are possible in some of the heaviest bands of snow. As a result, the Lake Effect Snow Warning has been extended though early Sunday for northern Houghton County. Keweenaw County will operate under a Lake Effect Snow Advisory through early Sunday.
Winds will become more northwesterly as the day progresses. That means portions of Alger and Luce Counties will begin to see some lake effect snow activity this afternoon into tonight. Some measurable snowfall will also been seen across the higher terrain of west/central Upper Michigan tonight/early Saturday. The National Weather Service has issued Lake Effect Snow Advisories for Alger and Luce Counties effective from 7 p.m. Friday night until 1 p.m. Saturday.
Lake Effect Snow Advisories have also been issued for Ontonagon and southern Houghton Counties. Those advisories are set to expire at 7 p.m. EST Saturday evening.
Finally, as arctic high pressure oozes into the Mississippi River Valley, clearing skies and light winds combine with some of the most frigid temperatures we??ve seen all season. Single digit highs are forecast for the western half of Upper Michigan this weekend. Overnight lows falling a few degrees below zero means that even the lightest zephyr will bring wind chill readings into the fifteen to twenty below range across the coldest portions of the western interior this weekend. Exposed skin can become frostbitten within about thirty minutes under these weather conditions. It's important to plan for the unexpected, especially when traveling long distances or venturing outside alone.These readings end up only a few degrees north of wind chill advisory criteria for our forecast area. However, if you??re headed out of town, portions of northwestern Wisconsin, Minnesota, and the Dakotas are under wind chill advisories as the core of arctic air will keep colder conditions across those areas.
A new low will bring more accumulating snow to the forecast area Sunday night/Monday. A reinforcing blast of cold air will keep periods of snow/lake effect snow and below normal temperatures through next week. Forecast models hint around at a meager warm up towards next weekend. By Friday, highs may reach into the mid 20s!