Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
406 AM CDT Thu Oct 23 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-240915-
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-
406 AM CDT Thu Oct 23 2025 /506 AM EDT Thu Oct 23 2025/

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

.DAY ONE...Today and Tonight.

Weather hazards expected...

  Significant Frost and Freeze Risk tonight.

DISCUSSION...

Freezing temperatures are expected tonight away from Lake
Michigan and the core of the Chicago urban heat island. Some frost
is possible near the lake, mainly away from downtown Chicago.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday night...
  Elevated Frost Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

$$

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
859 AM CDT Thu Oct 23 2025

ILZ105-INZ002-240000-
/O.CON.KLOT.FR.Y.0004.251024T0600Z-251024T1300Z/
Southern Cook-Porter-
Including the cities of Calumet City, Lemont, Portage,
Chesterton, Park Forest, Oak Forest, Orland Park, and Valparaiso
859 AM CDT Thu Oct 23 2025

...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 8 AM CDT FRIDAY...

* WHAT...Temperatures as low as 30 will result in frost formation
  away from Lake Michigan.

* WHERE...In Illinois, Southern Cook County. In Indiana, Porter
  County.

* WHEN...From 1 AM to 8 AM CDT Friday.

* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
  outdoor plants may be killed if left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

DK

Hazard Report Provided By forecast.weather.gov