Wednesday forecast: Could be chilliest day in six months, with first frost likely for far inland areas this week
An October chill is in the air, and some parts of Chicagoland could see the first frost of the season this week.
Another cloudy, windy and chilly day is in store for Wednesday, with high temperatures barely cracking 50 and west winds gusting up to 30 miles per hour.
Temps will hold in the 40s for most of the day Wednesday. The last time a daytime high was 50 degrees or colder was back on April 10, when the high peaked at a chilly 43 degrees.
Temps will then drop into the 30s overnight, with a Frost Advisory in effect from midnight until 9 a.m. Thursday for DeKalb, LaSalle, Grundy and Kankakee counties, all locations well inland from Lake Michigan.
Patchy frost is expected in these areas overnight into Thursday morning, then widespread frost is looking to be most likely by Friday morning.
Sunshine is expected to return Thursday, with high temps in the low to mid-50s, then the coming weekend shows a warming trend (see more below).
Low pressure over the Great Lakes will continue to funnel in cool air and a brisk west to northwest wind.
Winds will remain elevated throughout the day, adding to the early-season chill.
Early-morning wind chills dipped into mid-30s for much of the area.
Even by mid-afternoon, blustery winds will make it “feel” like the low 40s for many locations, except for the far southwest suburbs, where a few peeks of sun are most likely to occur.
The current Upper Northwest steering winds that are responsible for the chilly temperatures retreat northeast into Canada, allowing milder air to return to the Chicagoland area over the coming weekend.
The early Autumn chill slowly breaks down, giving way to milder, more seasonable air this weekend and into next week.
Milder than normal overall temperatures are predicted for the final days of October across the Great Lakes and Upper Midwest.
Tropical Storm Melissa is a slow-moving storm with heavy rains expected to overspread Hispaniola during the next couple days.
Goes-19 satellite/radar depiction of the storm:
Central pressure reaches 992 mb, which would be enough for at least a Category 1 hurricane.
It’s a very slow-moving system, which is likely to produce torrential rain. Melissa will bring heavy rainfall to Haiti and the Dominican Republic, with totals of 5 to 10 inches expected through Friday.
Tropical Storm force winds may reach parts of Jamaica by Thursday.
The heaviest totals are predicted to fall over portions of the Dominican Republic.
Key Tropical Storm Melissa messages from the National Hurricane Center:
Climate and Environment news: WGN Weather Center blog
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