Chicago Weather: Weekend Winter Storm Live Updates

Chicago (CBS) -- Heavy snow is expected to move from the northwest into the Chicago area starting Friday afternoon around 3 p.m.

Check out the current conditions.

The latest updates:

Friday, January 18

5:40 p.m. Hundreds Of Flights Canceled

At O'Hare International Airport, at least 199 flights have been canceled as of 5:40 p.m., with delays averaging less than 15 minutes.

At Midway International Airport, at least 110 flights have been canceled as of 5:40 p.m., with delays averaging less than 15 minutes.

Southwest announced that scheduled service to the following cities may be disrupted due to the Winter Storm Harper.

Friday, January 18, through Saturday, January 19

Cincinnati (CVG)
Cleveland (CLE)
Columbus (CMH)
Detroit (DTW)
Indianapolis (IND)
Kansas City (MCI)
St. Louis (STL)

Friday, January 18, through Monday, January 21

Albany (ALB)
Boston (BOS)
Buffalo (BUF)
Chicago (MDW)
Hartford (BDL)
Long Island MacArthur (ISP)
Manchester (MHT)
Milwaukee (MKE)
Newark (EWR)
New York LaGuardia (LGA)
Philadelphia (PHL)
Pittsburgh (PIT)
Portland, Maine (PWM)
Providence (PVD)
Rochester (ROC)

3 p.m. First Snow Reported

CBS 2's Mary Kay Kleist reported light snow over Crystal Lake, Woodstock, Wheaton and Glen Ellyn.

12:45 p.m. Hundreds Of Flights Canceled

Friday's expected winter weather is already causing delays for travelers heading out for the holiday weekend. Hundreds of flights have been canceled at O'Hare and Midway.

At O'Hare International Airport, at least 111 flights have been canceled as of 12:45 p.m., with delays averaging less than 15 minutes.

At Midway International Airport, at least 101 flights have been canceled as of 12:45 p.m., with delays averaging less than 15 minutes.

11 a.m. Illinois Department Of Transportation Issues Warning About Weekend Travel

"The IDOT snow-and-ice teams will be working throughout the weekend making roads as safe as possible," said Illinois Department of Transportation Deputy Secretary Omer Osman. "The public is advised to plan ahead and ask if their trip is necessary before heading out. Please, if you are driving, slow down, anticipate much longer travel times, increase your distance between other vehicles and exercise caution when sharing the road with our plows."

IDOT said it will have crews pre-treating bridges, overpasses, ramps and other areas susceptible to icing Friday. During the storm, IDOT will have more than 1,700 trucks and equipment statewide available, applying salt and treating roads.

9 a.m. Cook County Opens Warming Centers

Cook County announced hours for warming centers in its municipalities.