


Hazardous Weather Outlook
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
273 FLUS43 KLOT 300144 HWOLOT Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 844 PM CDT Tue Jul 29 2025 ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002- 010-011-019-310300- 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- 844 PM CDT Tue Jul 29 2025 /944 PM EDT Tue Jul 29 2025/ This Hazardous Weather Outlook is for portions of north central Illinois...northeast Illinois and northwest Indiana. .DAY ONE...Tonight. Weather hazards expected... Limited Thunderstorm Risk toward sunrise. DISCUSSION... Thunderstorms with gusty winds may approach northwest Illinois late tonight, though likely to remain west of the area until the daytime hours Wednesday. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Wednesday... Elevated Flooding Risk. Elevated Thunderstorm Risk...with an associated: Level 1 of 5 Severe Thunderstorm Risk. High Swim Risk Lake Michigan Beaches. Thursday... Limited Thunderstorm Risk. High Swim Risk Lake Michigan Beaches. Friday... High Swim Risk Lake Michigan Beaches. Monday... Limited Thunderstorm Risk. DISCUSSION... Periods of thunderstorms are likely Wednesday through Thursday morning. Some of these storms Wednesday could be strong to severe and also produce torrential rain which may lead to localized flash flooding. Periods of heavy rain are possible Wednesday night. High waves and dangerous swimming conditions are expected Wednesday afternoon through Friday afternoon at Lake Michigan beaches. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. GENERAL STORM MOTION OF THE DAY: Moving toward the east-southeast at 30 to 40 mph. $$ LMZ740>745-310300- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 844 PM CDT Tue Jul 29 2025 This Hazardous Weather Outlook is for portions of the Illinois nearshore waters of Lake Michigan and the Indiana nearshore waters of Lake Michigan. .DAY ONE...Tonight. Weather hazards expected... Limited Thunderstorm Risk toward sunrise. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Wednesday... Hazardous conditions for small craft are likely. Elevated Thunderstorm Risk...with an associated: Level 1 of 5 Severe Thunderstorm Risk. Thursday... Hazardous conditions for small craft are likely. Limited Thunderstorm Risk. Friday... Hazardous conditions for small craft are likely. Monday... Limited Thunderstorm Risk. $$ DK Visit us at www.weather.gov/chicago