Monsoonal moisture will produce showers and thunderstorms with heavy rain over parts of the Southwest, Great Basin, and Central Rockies through Monday. Flash flooding is possible, especially in and around burn scars and in areas of steep terrain. Heat will persist across the Central U.S. early this week, spreading into the Ohio Valley and Mid-Atlantic later this week. Read More >
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| 921 FLUS43 KLOT 310805 HWOLOT Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 305 AM CDT Mon Aug 31 2026 ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002- 010-011-019-010815- 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- 305 AM CDT Mon Aug 31 2026 /405 AM EDT Mon Aug 31 2026/ 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...with an associated: Level 1 of 5 Damaging Wind Risk...up to 60 mph. Level 1 of 5 Large Hail Risk...up to the size of a quarter. DISCUSSION... Widely scattered showers and storms are possible during the morning. Then chances for showers and storms in the after noon are possible that may become strong to severe, mainly northwest of the Fox Valley. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Tuesday... Limited Thunderstorm Risk...with an associated: Level 1 of 5 Severe Thunderstorm Risk. Limited Excessive Heat Risk, mainly south of Interstate 80. Wednesday... Limited Thunderstorm Risk. Limited Excessive Heat Risk. Thursday through Saturday... Limited Thunderstorm Risk. DISCUSSION... Hot and humid weather, with peak heat indices of 100 to 105, is forecast Tuesday and Wednesday, mainly south of Interstate 80. .SPOTTER INFORMATION STATEMENT... Spotters may not be needed, but any reports are appreciated. GENERAL STORM MOTION OF THE DAY: Moving toward the east-northeast at 30 to 40 mph. $$ LMZ740>745-010815- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 305 AM CDT Mon Aug 31 2026 This Hazardous Weather Outlook is for portions of the Illinois nearshore waters of Lake Michigan and the Indiana nearshore waters of Lake Michigan. .DAY ONE...Today and Tonight. Weather hazards expected... Limited Thunderstorm Risk. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Tuesday... Limited Thunderstorm Risk...with an associated: Level 1 of 5 Severe Thunderstorm Risk. Wednesday through Saturday... Limited Thunderstorm Risk. $$ DK Visit us at www.weather.gov/chicago |
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