Severe Thunderstorm and Tropical Storm Bertha Impacts
Numerous severe thunderstorms are expected across a broad region from the Ohio Valley to the Mid-Atlantic and Northeast States today into tonight. Swaths of damaging wind gusts are expected and some tornadoes are possible. Bertha is expected to bring tropical storm conditions to portions of the Gulf Coast from the Florida Panhandle westward to southeastern Louisiana later today and Wednesday. Read More >
| NWS Forecast for: Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake (LMZ779) Issued by: National Weather Service Chicago, IL Last Update: 249 PM CDT Tue Jul 21 2026 | |
Tonight: North winds to 30 kt diminishing to 15 to 25 kt. Slight chance of showers this evening. Waves 7 to 10 ft occasionally to 13 ft building to 8 to 11 ft occasionally to 14 ft, then subsiding to 7 to 10 ft occasionally to 13 ft. Wednesday: North winds 15 to 25 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 7 ft occasionally to 9 ft. Wednesday Night: North winds 10 to 20 kt diminishing to 5 to 10 kt after midnight, then becoming northwest late. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft. Thursday: West winds 10 to 15 kt becoming south 10 to 20 kt. Waves 1 to 3 ft. Thursday Night: South winds 10 to 20 kt becoming southwest 10 to 15 kt. Waves 1 to 3 ft. Friday: Southwest winds 10 to 15 kt becoming south 10 to 20 kt. Waves 1 to 2 ft. Friday Night: South winds 10 to 20 kt becoming southwest. Waves 1 to 3 ft. Saturday: Southwest winds 10 to 20 kt becoming south to 30 kt. Waves 1 to 2 ft building to 1 to 3 ft. Sunday: Southwest winds 10 to 20 kt becoming south 15 to 25 kt. Waves 3 to 5 ft. | |
| Zone Forecast: Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake (LMZ779) | |
Visit your local NWS office at: https://www.weather.gov/lot |