Heat — Will, Illinois

1999-07-28 to 1999-07-31 · Will, Illinois

Wider weather episode

An intense heat wave began in the Chicago metropolitan area July 28th and continued through the morning of July 31st. High temperatures on the 28th were in the lower to middle 90s with heat indices 100 to 105. On the 29th the temperatures soared to the middle and upper 90s with heat indices 110 to 120. The heat peaked on the 30th with high temperatures over 100 and heat indices around 115 to 120. Chicago set an all-time dew point record of 82 at Midway airport on the morning of the 30th. The minimum heat index in downtown Chicago was 100. Of the 99 fatalities, 93 were in Cook County, 3 were in Will County and 3 were in Lake County.

Source: NOAA Storm Events Database, event_id 5710168. Narrative written by the NWS forecast office that issued the report.