Severe thunderstorm and heavy rainfall threats will persist from the Midwest to Lower Great Lakes through Monday, shifting into the Ohio Valley and Central Appalachians Monday evening into Tuesday. Mid-summer heat will continue across much of the CONUS this week, with record highs possible well into the 100s across the south-central High Plains. Read More >
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| 794 FLUS43 KLOT 092015 HWOLOT Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 315 PM CDT Sun Aug 9 2026 ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002- 010-011-019-102015- 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- 315 PM CDT Sun Aug 9 2026 /415 PM EDT Sun Aug 9 2026/ This Hazardous Weather Outlook is for portions of north central Illinois...northeast Illinois and northwest Indiana. .DAY ONE...This afternoon and Tonight. Weather hazards expected... Elevated Thunderstorm Risk...with an associated: Level 2 of 5 Damaging Wind Risk...up to 60 mph. Level 2 of 5 Large Hail Risk...up to quarter size. Elevated Flooding Risk. DISCUSSION... Showers and thunderstorms will be most prevalent across the near south suburbs of Chicago and into northwest Indiana. A few of these storms may produce instances of penny to quarter size hail, wind gusts to 60 mph, and very heavy rain especially along and north of Interstate 80 close to the lake shore. Additional thunderstorms may develop later this evening, with the potential to produce additional localized severe weather as well as locally heavy rainfall which could lead to instances of flash flooding. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Monday... Elevated Flooding Risk. Significant Thunderstorm Risk...with an associated: Level 2 of 5 Severe Thunderstorm Risk. Limited Excessive Heat Risk. Tuesday... Elevated Flooding Risk. Limited Thunderstorm Risk...with an associated: Level 2 of 5 Severe Thunderstorm Risk. Limited Excessive Heat Risk. Wednesday... Limited Flooding Risk. Limited Thunderstorm Risk. Thursday... Elevated Flooding Risk. Limited Thunderstorm Risk. Friday and Saturday... Limited Thunderstorm Risk. DISCUSSION... Additional rounds of showers and thunderstorms are likely across the region Monday through at least Wednesday, with a continued threat of flash flooding and severe weather at times, especially Monday into Tuesday. .SPOTTER INFORMATION STATEMENT... Spotters may be needed this afternoon. GENERAL STORM MOTION OF THE DAY: Moving toward the east southeast at 40 to 45 mph. $$ LMZ740>745-102015- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 315 PM CDT Sun Aug 9 2026 This Hazardous Weather Outlook is for portions of the Illinois nearshore waters of Lake Michigan and the Indiana nearshore waters of Lake Michigan. .DAY ONE...This afternoon and Tonight. Weather hazards expected... Elevated Thunderstorm Risk...with an associated: Level 2 of 5 Thunderstorm Wind Gust Risk...up to 50 knots. Level 2 of 5 Hail Risk...up to penny size. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Monday... Elevated Thunderstorm Risk...with an associated: Level 2 of 5 Severe Thunderstorm Risk. Tuesday... Limited Thunderstorm Risk...with an associated: Level 1 of 5 Severe Thunderstorm Risk. Wednesday through Saturday... Limited Thunderstorm Risk. $$ KMD Visit us at www.weather.gov/chicago |
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