Active Weather Alerts
Special Marine Warning
Issued: 7:35 AM Aug. 17, 2025 – National Weather Service
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 345 AM CDT... For the following areas... Nearshore Waters from Wilmette Harbor to Calumet Harbor... Nearshore Waters from Calumet Harbor to Michigan City... Open Waters from Wilmette Harbor to Michigan City out to Mid Lake... At 234 AM CDT, strong thunderstorms were located along a line extending from near Montrose Harbor to near Diversy Harbor to near Midway Airport to 8 nm southwest of Ohare Airport, moving southeast at 45 knots. HAZARD...Wind gusts to nearly 50 knots. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Locations impacted include... Harrison-Dever Crib, Burnham Harbor, Hammond Marina, Wilmette Harbor, Jackson Park Harbor, 31st Street Harbor, Monroe Harbor, Burns Harbor, Calumet Harbor, Marina Shores at Dune Harbor, Michigan City, and 59th Street Marina. PRECAUTIONARY/PREPAREDNESS ACTIONS... Boaters should seek safe harbor immediately until these storms pass. Wind gusts to nearly 50 knots, high waves, dangerous lightning, and heavy rain are possible with these storms. Frequent lightning is occurring with these storms. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects. && HAIL...0.00IN; WIND...49KTS
Flood Advisory
Issued: 7:04 AM Aug. 17, 2025 – National Weather Service
...FLOOD ADVISORY IN EFFECT UNTIL 5 AM CDT EARLY THIS MORNING... * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Portions of northeast Illinois, including the following counties, Kankakee and Will and northwest Indiana, including the following counties, Jasper, Lake IN, Newton and Porter. * WHEN...Until 500 AM CDT. * IMPACTS...Creeks and streams may rise out of their banks. Roads and streets may be flooded. * ADDITIONAL DETAILS... - At 203 AM CDT, Doppler radar indicated torrential rain producing thunderstorms over much of the advisory area. Between 1 and 2 inches of rain have fallen according to radar estimates. - Additional rainfall amounts up to 1.5 inches are expected over the areas that receive the heaviest rain rates. Runoff from the rain that has fallen and additional rainfall will result in minor flooding. - Some locations that will experience flooding include... Merrillville, Schererville, Crown Point, Park Forest, Cedar Lake, Steger, Lowell, Rensselaer, DeMotte, Hebron, Morocco, Wheatfield, Lake Village, Dyer, St. John, Richton Park, Crete, University Park, Lakes of the Four Seasons and Monee. - http://www.weather.gov/safety/flood PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. &&
Flood Advisory
Issued: 6:21 AM Aug. 17, 2025 – National Weather Service
...FLOOD ADVISORY IN EFFECT UNTIL 415 AM CDT EARLY THIS MORNING... * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Portions of northeast Illinois, including the following county, Cook and northwest Indiana, including the following counties, Lake IN and Porter. * WHEN...Until 415 AM CDT. * IMPACTS...Flooding may occur in poor drainage and urban areas, including flooded underpasses, roads, and streets. Creeks and streams may rise out of their banks. * ADDITIONAL DETAILS... - At 119 AM CDT, Doppler radar indicated thunderstorms producing torrential rainfall. Up to 1.5 inches of rain have fallen according to radar estimates and gauge observations. - Additional rainfall amounts up to 1 inch are expected over portions of the advisory area. Runoff from the rain that has already fallen and additional rainfall will result in flooding. - Some locations that will experience flooding include... South Chicago, Hammond, Gary, Orland Park, Tinley Park, Oak Lawn, Calumet City, Portage, Merrillville, Valparaiso, Chicago Heights, Roseland, East Chicago, Schererville, Hobart, Lansing, Oak Forest, Crown Point, Harvey and Homer Glen. - http://www.weather.gov/safety/flood PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. &&
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