Widespread life-threatening flash and urban flooding continues in south-central Texas, with considerable flooding impacts possible across central Texas. Wildfire smoke is impacting air quality across much of the Great Lakes region into southern New England and the Mid-Atlantic. Monsoonal thunderstorms may produce isolated to scattered flash flooding across the Southwest into the Great Basin. Read More >
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| 876 FLUS43 KLOT 180850 HWOLOT Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 350 AM CDT Sat Jul 18 2026 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- 350 AM CDT Sat Jul 18 2026 /450 AM EDT Sat Jul 18 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... Elevated Thunderstorm Risk...with an associated: Level 2 of 5 Damaging Wind Risk...up to 60 mph. Level 1 of 5 Large Hail Risk...up to one inch in diameter. Limited Flooding Risk. Limited Excessive Heat Risk. High Swim Risk Lake Michigan Beaches tonight. DISCUSSION... Thunderstorms are expected to develop along a passing cold front this afternoon, some of which could be strong to severe. The biggest concerns with thunderstorms will be damaging wind gusts and localized flooding. Small to marginally severe hail will be possible as well. The highest thunderstorm coverage and greatest severe threat are expected near and south of I-80. High temperatures will reach the upper 80s and lower 90s today with afternoon heat indices peaking near or just over 100 degrees, especially near and south of I-80. Additionally, gusty northerly winds in the wake of the cold front will bring hazardous swimming conditions to southern Lake Michigan beaches tonight into Sunday morning. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Sunday... High Swim Risk Lake Michigan Beaches in the morning. Monday... Limited Flooding Risk. Elevated Thunderstorm Risk...with an associated: Level 2 of 5 Severe Thunderstorm Risk. Tuesday... Limited Thunderstorm Risk. High Swim Risk Lake Michigan Beaches. Wednesday... High Swim Risk Lake Michigan Beaches. DISCUSSION... Additional rounds of thunderstorms are likely Saturday and Monday, some of which could be strong to severe. .SPOTTER INFORMATION STATEMENT... Spotters may be needed this afternoon. GENERAL STORM MOTION OF THE DAY: Moving toward the south-southeast at 20 to 25 mph. $$ LMZ740>745-190900- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 350 AM CDT Sat Jul 18 2026 This Hazardous Weather Outlook is for portions of the Illinois nearshore waters of Lake Michigan and the Indiana nearshore waters of Lake Michigan. .DAY ONE...Today and Tonight. Weather hazards expected... Hazardous conditions for small craft. Elevated Thunderstorm Risk...with an associated: Level 2 of 5 Thunderstorm Wind Gust Risk...up to 50 knots. Level 1 of 5 Hail Risk...up to one inch in diameter. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Sunday... Hazardous conditions for small craft are likely. Monday... Limited Thunderstorm Risk...with an associated: Level 1 of 5 Severe Thunderstorm Risk. Tuesday... Hazardous conditions for small craft are likely. Limited Thunderstorm Risk. Wednesday... Hazardous conditions for small craft are likely. $$ Doom Visit us at www.weather.gov/chicago |
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