A cold ridge of Canadian high pressure centered over Minnesota is feeding the coldest air of the season into northern Illinois. A FREEZE WARNING has been issued for Stephenson County and the rest of far northwestern Illinois from 4 am until 9 am Sunday. It will be mostly clear and cold across the north central part of north central Illinois with light northerly winds and widespread frost outside of the city of Rockford. Sunday will be mostly sunny and chilly with afternoon temperatures around 57 degrees. Sunday night will be frosty again. It is likely to be colder than Saturday night in the Rockford area, and areas of northern Illinois off to the south and east because Canadian high pressure will be sitting right over the area along with calm winds and good radiational cooling. There will be a slow warmup this week as the high pressure edges slowly off to the south. With high pressure dominating, sunshine will be a major factor all week long. No rain is expected, even though a weak dissipating front will move into the area on Wednesday night. Temperatures are expected to reach the low 70's by Wednesday, and possibly the middle 70's Friday and Saturday.
By Meteorologist
Eric Nefstead
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