Tuesday, May 28, 2019 
More than 600 flights were cancelled on Memorial Day in Chicago as severe weather enveloped the area resulting in heavy rain. A Tornado Watch was issued for nearly all of the Chicago area until 9 p.m., as per the National Weather Service. As of 10:56 p.m. Monday, there were more than 551 flights cancelled at O’Hare Airport and at least 76 flights cancelled at Midway Airport.
Delays of at least 29 minutes were expected at O’Hare and delays of about 30 minutes were expected at Midway.
Any severe storms that developed in this system would bring golf ball-sized hail, wind gusts of up to 70 mph, torrential downpours, lightning and possibly even tornadoes. The storms are expected to weaken by around midnight.
Temperature highs varied depending on the location on Monday. Along the lakefront, highs will sit in the mid to upper 50s, but inland temperatures will reach into the 70s. Some locations south of Interstate 80 could see temperatures in the 80s.
Another round of potentially severe evening storms will be possible Tuesday.
O’Hare Intl. Airport tweeted “Airlines at O’Hare have canceled more than 500 flights today due to heavy rain in the area. Delays av. 1.5 hours. Check with your airline for flight status.”
Thursday, March 23, 2023