Clear skies and light winds under cold high pressure Friday night created near-perfect
radiational cooling conditions.
As a result, early Saturday morning temperatures in the mid to upper 30s and scattered
light frost were expected across northern Illinois. Frost warnings were issued for all of
Wisconsin with early morning readings just north of the Illinois-Wisconsin border
forecast in the lower 30s. East to southeast winds on the backside of cool Canadian
high pressure centered over the northeastern United States will hold over northeast
Illinois this weekend. But as the high slowly loses its grip and moves off the New
England coast, Chicago will experience a gradual moderation of temperatures. Highs on
Saturday will not be that much different than Friday's levels, but Sunday should see the
readings reach the "normal" level (67 degrees) for the first time in a week.
INCREASING TEMPERATURES,
CHANCE OF SHOWERS EARLY NEXT WEEK
As warmer, more moist air approaches from the west, Chicago's early workweek
weather should feature above-normal temperatures and a good chance of showers and
thunderstorms.
--By Paul Dailey, WGN Weather Center Meteorologist
