Saturday, plan on bitter cold with snow showers and flurries heaviest in eastern Upper Michigan east of Marquette. Highs will mainly be in the single numbers to about 10 above with coldest readings in the eastern portion of Upper Michigan. On Saturday night, arctic high pressure will drift right across Upper Michigan. That means clearing skies for most except right near the Lake Superior shore in the east. Clear skies and light winds will lead to the coldest night of the year in some locations. Lows will be coldest in portions of the central interior where skies clear and winds drop off. Some locations there may drop below 10 below zero. In the west temperatures may actually rise some as southerly winds set in.
On Sunday the high will drift eastward. Look for sunshine with increasing cloudiness. Some lake effect snow showers may develop off Lake Michigan into eastern sections as winds turn to the south. Highs will mainly be in the teens but may touch 20 in parts of the south and central U.P. Warmer weather is expected early next week with temperatures again rising to above average values.