Active Weather Alerts
Small Craft Advisory
Issued: 8:09 AM Apr. 18, 2026 – National Weather Service
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 PM CDT THIS EVENING... * WHAT...Northwest winds to 25 kt and significant waves to 5 ft. * WHERE...Illinois and Indiana nearshore from Winthrop Harbor IL to Michigan City IN. * WHEN...Until 10 PM CDT this evening. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. &&
Flood Warning
Issued: 6:54 AM Apr. 18, 2026 – National Weather Service
...FLOOD WARNING IN EFFECT UNTIL 8 AM CDT THIS MORNING... ...REPLACES FLASH FLOOD WARNING... * WHAT...Flooding caused by excessive rainfall is occurring. * WHERE...Portions of north central and northeast Illinois, including the following counties, in north central Illinois, Boone. In northeast Illinois, Lake IL and McHenry. * WHEN...Until 800 AM CDT Saturday. * IMPACTS...Roads and streets may be flooded. Area creeks and streams are already elevated, increasing the risk of flooding due to additional rainfall. * ADDITIONAL DETAILS... - At 152 AM CDT, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms. Flooding is ongoing or expected to begin shortly. Up to 2 inches of rain have fallen. - Some locations that will experience flooding include... Waukegan, Buffalo Grove, Crystal Lake, North Chicago, Gurnee, Mundelein, Algonquin, Highland Park, Lake in the Hills, Round Lake Beach, McHenry, Belvidere, Vernon Hills, Woodstock, Zion, Huntley, Loves Park, Grayslake, Libertyville and Lake Zurich. - http://www.weather.gov/safety/flood PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Warning means flooding is imminent or may already be occurring. Persons along rivers, creeks, and other waterways should take immediate precautions to protect life and property. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. &&
River Flood Warning
Issued: 6:33 AM Apr. 18, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE... * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Des Plaines River from IL/WI state line downstream to US-41 in Gurnee, including the Russell gauge. * WHEN...Until further notice. * IMPACTS...At 8.0 feet, Agricultural and park land is inundated near the river. Residential property is threatened near the river. At 9.5 feet, Residential structures threatened along Russell Road between the river and Kilbourne Road. Industrial parking lots threatened along Kilbourne Road. * ADDITIONAL DETAILS... - At 12:30 AM CDT Saturday the stage was 9.2 feet. - Recent Activity...Recent rainfall caused the river level to jump quickly from 8.7 feet this morning to now over 9 feet. - Forecast...The river is expected to crest at just over 9 feet early Saturday before gradually falling over the next few days. - Flood stage is 7.0 feet. - http://www.weather.gov/safety/flood &&
River Flood Warning
Issued: 6:32 AM Apr. 18, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE... * WHAT...Moderate flooding is occurring and major flooding is forecast. * WHERE...Des Plaines River from Townline Road in Libertyville downstream to Palatine Road in Prospect Heights, including the Lincolnshire gauge. * WHEN...Until further notice. * IMPACTS...At 15.0 feet, Structures threatened along IL-22 (Half-Day Road) just east of the river. Multiple structures threatened near and west of US-45 (Milwaukee Avenue) and Deerfield Road. Deerfield Road threatened near the river. Multiple trails inundated in Half-Day Forest Preserve. * ADDITIONAL DETAILS... - At 12:45 AM CDT Saturday the stage was 14.1 feet. - Recent Activity...Recent rainfall caused the river level to rise quickly from 13.6 feet this afternoon to now over 14 feet. - Forecast...The river is expected to rise to a crest near 15.5 feet late Saturday. It will then gradually fall through the early part of next week. - Flood stage is 12.5 feet. - http://www.weather.gov/safety/flood &&
River Flood Warning
Issued: 4:24 AM Apr. 18, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE... * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Fox River from Johnsburg downstream to Red Gate Road in St. Charles, including the Algonquin Lock & Dam tailwater gauge. * WHEN...Until further notice. * IMPACTS...At 11.5 feet, Residences threatened along Oceola Drive in Algonquin. A few residences threatened along McBridge Street in Elgin. Jayne Street and Beach Drive threatened in Algonquin. River Street threatened in East Dundee. Jerusha Avenue threatened in Elgin. Fox River Trail threatened between East Dundee and Elgin. At 12.0 feet, Structures threatened along River Street, Johnson Street, and Maiden Lane in East Dundee. North Harrison Street threatened near Riverside Park in Algonquin. Washington Street threatened in Carpentersville. Water Street, Edwards Avenue, and Elgin Avenue threatened in East Dundee. Bayview Road threatened in Elgin. Low-lying areas of Festival Park are threatened in Elgin. * ADDITIONAL DETAILS... - At 10:30 PM CDT Friday the stage was 10.9 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:30 PM CDT Friday was 10.9 feet. The river has begun to rise due to recent rainfall. - Forecast...The river is now expected to crest near 11.5 to 12.0 feet late next week due to recent rainfall. - Flood stage is 9.5 feet. - Flood History...This crest compares to a previous crest of 11.8 feet on 05/23/2020. - http://www.weather.gov/safety/flood &&
River Flood Warning
Issued: 4:18 AM Apr. 18, 2026 – National Weather Service
...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE... * WHAT...Major flooding is occurring and major flooding is forecast. * WHERE...Fox River Lower near New Munster. * WHEN...Until further notice. * IMPACTS...At 15.0 feet, Highway 50 is closed due to floodwaters over the highway. There is widespread flooding in the Town of Wheatland and Village of Salem Lakes. Floodwaters are into the lower levels of some homes in those areas along Riverside Drive, Shorewood Drive, 101st Street and Shorewood Terrace. * ADDITIONAL DETAILS... - At 10:00 PM CDT Friday the stage was 14.2 feet. - Bankfull stage is 10.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:00 PM CDT Friday was 14.2 feet. - Forecast...The river is expected to rise to a crest of 15.0 feet early Sunday afternoon. - Flood stage is 11.0 feet. - Flood History...This crest compares to a previous crest of 15.0 feet on 08/24/2007. - http://www.weather.gov/safety/flood && River forecasts are available for some but not all river gaging locations. The 7 day river forecast takes into account past precipitation, soil moisture conditions, and predicted precipitation for the basin. Precipitation is for the next 24 hours in the future from April through September and for 48 hours in the future from October through March. (Stages in ft.) Bank- Latest Forecast stages - Flood full observed ...for 1 am... Location stage stage stage/time Sun Mon Tue Wed New Munster 11.0 10.0 14.24 10 pm 4/17 14.9 14.8 14.2 13.5 - Highest 24 hour change - observed in river stage - stage in (ft.) up to Highest stage - the last latest observed forecast in - 7 days stage next 7 days New Munster 14.24 10 pm 4/17 0.85 15.00 1 pm 4/19 &&
River Flood Warning
Issued: 4:13 AM Apr. 18, 2026 – National Weather Service
...FLOOD WARNING NOW IN EFFECT UNTIL FRIDAY, APRIL 24... * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Des Plaines River from US-41 in Gurnee downstream to Townline Road in Vernon Hills, including the Gurnee gauge. * WHEN...Until Friday, April 24. * IMPACTS...At 10.0 feet, Residences threatened along Kilbourne Road and near O'Plaine Road and McClure Avenue in Gurnee. Businesses threatened along Old Grand Avenue near IL-132 in Gurnee. IL-132 (Grand Avenue) is threatened east of the river in Gurnee. * ADDITIONAL DETAILS... - At 10:30 PM CDT Friday the stage was 9.4 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:30 PM CDT Friday was 9.4 feet. The river has begun to rise due to recent rainfall. - Forecast...The river is expected to crest near 10.0 feet on Sunday. - Flood stage is 7.0 feet. - Flood History...This crest compares to a previous crest of 9.8 feet on 05/20/2020. - http://www.weather.gov/safety/flood &&
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