Hazard Report Provided By forecast.weather.gov

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
151 AM CDT Tue Jun 30 2026

ILZ103>105-301700-
/O.EXT.KLOT.XH.W.0001.000000T0000Z-260703T0500Z/
Northern Cook-Central Cook-Southern Cook-
Including the cities of Evanston, Park Forest, Oak Park,
Schaumburg, Chicago, La Grange, Oak Forest, Cicero, Oak Lawn,
Lemont, Calumet City, Northbrook, Des Plaines, Palatine, and
Orland Park
151 AM CDT Tue Jun 30 2026

...EXTREME HEAT WARNING NOW IN EFFECT UNTIL MIDNIGHT CDT THURSDAY
NIGHT...

* WHAT...Dangerously hot conditions with heat index values around
  105 expected each afternoon.

* WHERE...Central Cook, Northern Cook, and Southern Cook Counties.

* WHEN...Until midnight CDT Thursday Night.

* IMPACTS...Heat related illnesses increase significantly during
  extreme heat and high humidity events.

* ADDITIONAL DETAILS...Dangerous heat is now expected to persist
  through Thursday. Thunderstorms may begin to bring some relief
  from the heat by Thursday afternoon or evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

The magnitude of anticipated heat, combined with oppressive warmth
at night will lead to hazardous conditions, particularly for the
elderly and those with pre-existing health conditions. Residents of
the city of Chicago can call 3 1 1 to request well being checks for
elderly friends or family members, or for information on finding the
nearest cooling center.

Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.

&&

$$

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
350 AM CDT Tue Jun 30 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-010900-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
350 AM CDT Tue Jun 30 2026 /450 AM EDT Tue Jun 30 2026/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Today and Tonight.

Weather hazards expected...

  Elevated Excessive Heat Risk.

DISCUSSION...

Dangerous heat with afternoon heat index values over 100 degrees
is expected again today. Oppressive heat will continue through
midnight especially in the city of Chicago where heat indices are
not expected to fall below 90 degrees until after midnight.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday and Thursday...
  Elevated Excessive Heat Risk.
Thursday night...
  Limited Flooding Risk.
  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
  Elevated Excessive Heat Risk.
Friday...
  Limited Flooding Risk.
  Limited Thunderstorm Risk.
  Limited Excessive Heat Risk.
Saturday and Sunday...
  Limited Thunderstorm Risk.

DISCUSSION...

Dangerous heat will likely persist into Thursday across much of
the area. Thunderstorm chances will increase late Thursday and
continue at times through the holiday weekend.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

$$

Hazard Report Provided By forecast.weather.gov