Categories: Illinois News

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.

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   7

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.

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   8

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).

Wednesday: Surface map  

Low pressure over the Great Lakes will continue to funnel in cool air and a brisk west to northwest wind.    

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   9

Wednesday: Day planner

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   10

Wednesday: Peak wind gusts

Winds will remain elevated throughout the day, adding to the early-season chill. 

Wednesday: Wind chills

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.  



Current Conditions

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   11
Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   12
Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   13
Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   14

Next Few Hours

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   15
Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   16

Extended Outlook

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. 

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   17
Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   18

Chicago forecast: High temperatures and departure from normal

The early Autumn chill slowly breaks down, giving way to milder, more seasonable air this weekend and into next week. 

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   19

6-10-day temperature outlook: Oct. 27-31

Milder than normal overall temperatures are predicted for the final days of October across the Great Lakes and Upper Midwest. 

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   20

Tropical Storm Melissa forms in the Caribbean

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:  

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   21

Potential track of Melissa based off ECMWF Model

Central pressure reaches 992 mb, which would be enough for at least a Category 1 hurricane.

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   22

Melissa: Official National Hurricane Center track

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.

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   23

Melissa: Tropical Storm force winds

Tropical Storm force winds may reach parts of Jamaica by Thursday.    

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   24

Melissa: Rainfall projections

The heaviest totals are predicted to fall over portions of the Dominican Republic.   

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   25

Key Tropical Storm Melissa messages from the National Hurricane Center:

  1. Melissa is expected to bring heavy rainfall and the risk of
    significant flash flooding and the danger of landslides to portions
    of Haiti and the Dominican Republic through the weekend.
  2. Hurricane conditions are possible in the southwestern peninsula
    of Haiti where a Hurricane Watch is in effect.  A Tropical Storm
    Watch is in effect for Jamaica.  Preparations to protect life and
    property should be completed by Thursday.
  3. There is significant uncertainty in the track and intensity
    forecast of Melissa.  Interests elsewhere in Hispaniola and Cuba
    should continue to monitor the latest forecasts.

Wednesday forecast: could be chilliest day in six months, with first frost likely for far inland areas this week   26

Climate and Environment news: WGN Weather Center blog

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