Hazard Report Provided By forecast.weather.gov

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
853 PM CDT Mon Jun 29 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-106>108-INZ001-002-
010-011-019-301200-
/O.CON.KLOT.HT.Y.0001.000000T0000Z-260702T0300Z/
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-La
Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-Northern
Will-Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-
Benton-
Including the cities of La Salle, Joliet, Peotone, Roselawn,
Watseka, Pontiac, DeKalb, Oregon, Paxton, Hammond, Sycamore,
Wilmington, Fairbury, Plano, Woodstock, Mendota, Rochelle,
Bradley, Gibson City, Coal City, Gary, Elgin, Bolingbrook,
Valparaiso, Dixon, Ottawa, Downers Grove, Carol Stream, Streator,
DeMotte, Minooka, Oxford, Rensselaer, Yorkville, Gurnee,
Kankakee, Beecher, Mundelein, Buffalo Grove, Naperville, Aurora,
Belvidere, Lombard, Bourbonnais, Channahon, Crystal Lake, Morris,
Kentland, Manhattan, Crete, Rockford, Waukegan, Algonquin,
Dwight, Portage, Wheaton, Mokena, Oswego, Marseilles, Chesterton,
Fowler, Plainfield, Merrillville, Gilman, Morocco, McHenry, and
Byron
853 PM CDT Mon Jun 29 2026 /953 PM EDT Mon Jun 29 2026/

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 10 PM CDT /11 PM EDT/
WEDNESDAY...

* WHAT...Heat index values around 105 expected each afternoon

* WHERE...Portions of central, east central, north central, and
  northeast Illinois and northwest Indiana.

* WHEN...Until 10 PM CDT /11 PM EDT/ Wednesday.

* IMPACTS...Hot temperatures and high humidity may cause heat
  illnesses.

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.

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

&&

$$

Yack

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
215 PM CDT Mon Jun 29 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-301915-
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-
215 PM CDT Mon Jun 29 2026 /315 PM EDT Mon Jun 29 2026/

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

.DAY ONE...Tonight.

Weather hazards expected...

  Elevated Excessive Heat Risk.

DISCUSSION...

Oppressive heat will continue into this evening, especially in the
city of Chicago where heat indices will likely not drop below 90
until around midnight.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday and Wednesday...
  Significant Excessive Heat Risk.
Thursday...
  Elevated Excessive Heat Risk.
Thursday night through Saturday...
  Limited Flooding Risk.
  Limited Thunderstorm Risk.
  Limited Excessive Heat Risk.
Sunday...
  Limited Thunderstorm Risk.

DISCUSSION...

Dangerous heat will persist through Wednesday or Thursday.
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