628
WWUS73 KLOT 220821
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
321 AM CDT Tue Jul 22 2025

INZ001-002-010-011-019-221830-
/O.NEW.KLOT.HT.Y.0002.250723T1800Z-250724T0000Z/
Lake IN-Porter-Newton-Jasper-Benton-
Including the cities of Fowler, Roselawn, Portage, Morocco,
DeMotte, Merrillville, Chesterton, Rensselaer, Oxford, Hammond,
Valparaiso, Kentland, and Gary
321 AM CDT Tue Jul 22 2025 /421 AM EDT Tue Jul 22 2025/

...HEAT ADVISORY IN EFFECT FROM 1 PM CDT /2 PM EDT/ TO 7 PM CDT /8
PM EDT/ WEDNESDAY...

* WHAT...Heat index values up to 105 expected.

* WHERE...Benton, Jasper, Lake IN, Newton, and Porter Counties.

* WHEN...From 1 PM CDT /2 PM EDT/ to 7 PM CDT /8 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.

&&

$$

ILZ003>006-008-010>013-019>021-023-032-033-039-106>108-221830-
/O.CON.KLOT.XH.A.0002.250723T1500Z-250725T0300Z/
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-
Including the cities of Woodstock, Dwight, Peotone, Bourbonnais,
Paxton, Naperville, Wheaton, Mundelein, Kankakee, Algonquin,
Sycamore, Aurora, Crete, Oregon, Rochelle, Carol Stream, Dixon,
Mendota, Belvidere, Minooka, Elgin, Watseka, Gibson City, Joliet,
Marseilles, Oswego, Bolingbrook, McHenry, DeKalb, Downers Grove,
Mokena, Plainfield, Ottawa, Coal City, Pontiac, Channahon,
Manhattan, La Salle, Bradley, Waukegan, Gurnee, Byron, Crystal
Lake, Lombard, Streator, Gilman, Buffalo Grove, Wilmington,
Yorkville, Beecher, Fairbury, Rockford, Plano, and Morris
321 AM CDT Tue Jul 22 2025

...EXTREME HEAT WATCH REMAINS IN EFFECT FROM WEDNESDAY MORNING
THROUGH THURSDAY EVENING...

* WHAT...Dangerously hot conditions with heat index values of 105 to
  115 possible.

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

* WHEN...From Wednesday morning through Thursday evening.

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

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.

&&

$$

ILZ103>105-221830-
/O.CON.KLOT.XH.A.0002.250723T1500Z-250725T0300Z/
Northern Cook-Central Cook-Southern Cook-
Including the cities of Oak Forest, Palatine, Lemont, Evanston,
Orland Park, Des Plaines, Northbrook, Schaumburg, Chicago,
Cicero, Oak Park, La Grange, Calumet City, Park Forest, and Oak
Lawn
321 AM CDT Tue Jul 22 2025

...EXTREME HEAT WATCH REMAINS IN EFFECT FROM WEDNESDAY MORNING
THROUGH THURSDAY EVENING...

* WHAT...Dangerously hot conditions with heat index values of 105 to
  110 possible.

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

* WHEN...From Wednesday morning through Thursday evening.

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

* ADDITIONAL DETAILS...Heat indices late Wednesday night are not
  likely to drop much below 90 degrees, particularly in the city.
  Therefore, little to no heat relief is expected until sometime
  Thursday night.

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.

&&

$$

Birk