The NWS Chicago office has upgraded the heat advisory to an excessive heat warning for all but our northern tier of Illinois counties that border the Wisconsin state line. * WHERE…Ogle, De Kalb, Kane, DuPage, Northern Cook, Central Cook and Southern Cook Counties. * IMPACTS…Extreme heat and humidity will significantlyincrease the potential for heat related illnesses,particularly for those working or participating in outdoor activities. Know the signs and symptoms of heat exhaustion and heat stroke. Cook county`s warning criteria (formulated in the wake of the deadly 1995 heat wave) is three consecutive days of 100-105 degree peak heat indices.

Source: Fox News June 14, 2022 16:33 UTC