One product issued by NWS for: Deerfield IL
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
400 AM CDT Fri Jul 18 2025
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-190900-
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-
400 AM CDT Fri Jul 18 2025 /500 AM EDT Fri Jul 18 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...
Limited Thunderstorm Risk late tonight.
DISCUSSION...
A line of decaying thunderstorms may bring gusty winds to northern
Illinois west of the Chicago metro toward sunrise Saturday.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
Saturday...
Elevated Flooding Risk.
Elevated Thunderstorm Risk...with an associated:
Level 2 of 5 Severe Thunderstorm Risk.
Sunday through Monday...
Elevated Flooding Risk.
Limited Thunderstorm Risk.
Tuesday...
Limited Flooding Risk.
Limited Thunderstorm Risk.
Limited Excessive Heat Risk.
Wednesday and Thursday...
Limited Thunderstorm Risk.
Elevated Excessive Heat Risk.
DISCUSSION...
Several rounds of thunderstorms may occur through early next
week with strong to severe thunderstorms possible along with
torrential rain and localized flash flooding. The greatest chances
will remain south of I-80.
Dangerous heat and humidity is possible the middle of next week.
.SPOTTER INFORMATION STATEMENT...
Spotter activation will not be necessary through tonight.
GENERAL STORM MOTION OF THE DAY:
Moving toward the east at 30 mph.
$$