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Tuesday
Jul 21, 2026

Current Severe Weather Alerts in Illinois


There are currently 10 Weather Alerts in Illinoisselect a different state


Heat Advisory issued July 20 at 11:24PM CDT until July 21 at 11:00AM CDT by NWS Paducah KY

Event: Heat Advisory
Message Type: Update
Urgency: Expected
Severity: Moderate
Certainty: Likely
Affected Area: Jefferson; Perry; Franklin; Hamilton; Jackson; Williamson; Saline; Gallatin; Union; Johnson; Pope; Hardin; Alexander; Pulaski; Massac; Fulton; Hickman; Carlisle; Ballard; McCracken; Graves; Livingston; Marshall; Calloway; Crittenden; Lyon; Trigg; Caldwell; Union; Webster; Hopkins; Christian; Muhlenberg; Todd; Perry; Bollinger; Cape Girardeau; Wayne; Carter; Ripley; Butler; Stoddard; Scott; Mississippi; New Madrid

Wheather Alert Summary: * what...For the heat advisory, heat index values of 100 to 106. for the extreme heat warning, dangerously hot conditions with heat index values of 110 to 116. * where...Portions of southern illinois, western kentucky, and southeast missouri. * when...For the heat advisory, until 11 am cdt tuesday. for the extreme heat warning, from 11 am to 7 pm cdt tuesday. * impacts...Heat related illnesses increase significantly during extreme heat and high humidity events. hot temperatures and high humidity may cause heat illnesses.

Official National Weather Service Weather Alert Statement

Heat Advisory issued July 20 at 11:24PM CDT until July 21 at 7:00PM CDT by NWS Paducah KY

Event: Heat Advisory
Message Type: Update
Urgency: Expected
Severity: Moderate
Certainty: Likely
Affected Area: Wayne; Edwards; Wabash; Gibson; Pike

Wheather Alert Summary: * what...Heat index values of 105 to 109 expected. * where...In illinois, edwards, wabash, and wayne il counties. in indiana, gibson and pike counties. * when...From 11 am cdt /noon edt/ to 7 pm cdt /8 pm edt/ tuesday. * impacts...Hot temperatures and high humidity may cause heat illnesses.

Official National Weather Service Weather Alert Statement

Extreme Heat Warning issued July 20 at 11:24PM CDT until July 21 at 7:00PM CDT by NWS Paducah KY

Event: Extreme Heat Warning
Message Type: Update
Urgency: Expected
Severity: Severe
Certainty: Likely
Affected Area: White; Posey; Vanderburgh; Warrick; Spencer; Henderson; Daviess; McLean

Wheather Alert Summary: * what...Dangerously hot conditions with heat index values of 110 to 116 expected. * where...In illinois, white county. in indiana, posey, spencer, vanderburgh, and warrick counties. in kentucky, daviess, henderson, and mclean counties. * when...From 11 am to 7 pm cdt tuesday. * impacts...Heat related illnesses increase significantly during extreme heat and high humidity events.

Official National Weather Service Weather Alert Statement

Extreme Heat Warning issued July 20 at 11:24PM CDT until July 21 at 7:00PM CDT by NWS Paducah KY

Event: Extreme Heat Warning
Message Type: Update
Urgency: Expected
Severity: Severe
Certainty: Likely
Affected Area: Jefferson; Perry; Franklin; Hamilton; Jackson; Williamson; Saline; Gallatin; Union; Johnson; Pope; Hardin; Alexander; Pulaski; Massac; Fulton; Hickman; Carlisle; Ballard; McCracken; Graves; Livingston; Marshall; Calloway; Crittenden; Lyon; Trigg; Caldwell; Union; Webster; Hopkins; Christian; Muhlenberg; Todd; Perry; Bollinger; Cape Girardeau; Wayne; Carter; Ripley; Butler; Stoddard; Scott; Mississippi; New Madrid

Wheather Alert Summary: * what...For the heat advisory, heat index values of 100 to 106. for the extreme heat warning, dangerously hot conditions with heat index values of 110 to 116. * where...Portions of southern illinois, western kentucky, and southeast missouri. * when...For the heat advisory, until 11 am cdt tuesday. for the extreme heat warning, from 11 am to 7 pm cdt tuesday. * impacts...Heat related illnesses increase significantly during extreme heat and high humidity events. hot temperatures and high humidity may cause heat illnesses.

Official National Weather Service Weather Alert Statement

Heat Advisory issued July 20 at 8:23PM CDT until July 21 at 7:00PM CDT by NWS St Louis MO

Event: Heat Advisory
Message Type: Update
Urgency: Expected
Severity: Moderate
Certainty: Likely
Affected Area: Clinton; Washington; Randolph; Madison; St. Clair; Monroe; Boone; Moniteau; Cole; Osage; Callaway; Montgomery; Gasconade; Warren; St. Charles; Franklin; St. Louis; St. Louis City; Jefferson; Crawford; Washington; St. Francois; Ste. Genevieve; Iron; Madison; Reynolds

Wheather Alert Summary: * what...Heat index values up to 109. * where...Portions of south central and southwest illinois and central, east central, and southeast missouri. * when...Until 7 pm cdt tuesday. * impacts...Hot temperatures and high humidity may cause heat illnesses.

Official National Weather Service Weather Alert Statement

Air Quality Alert issued July 20 at 12:24PM CDT by NWS St Louis MO

Event: Air Quality Alert
Message Type: Alert
Urgency: Unknown
Severity: Unknown
Certainty: Unknown
Affected Area: Greene; Macoupin; Montgomery; Bond; Fayette; Clinton; Marion; Washington; Randolph; Adams; Brown; Pike; Calhoun; Jersey; Madison; St. Clair; Monroe

Wheather Alert Summary: The illinois environmental protection agency in springfield illinois is forecasting unhealthy conditions for sensitive groups (usg) for fine particulates from wildfire smoke until midnight cdt tonight. active children and adults, especially people with pulmonary or respiratory disease such as asthma, should limit prolonged outdoor activity. residents are urged to reduce pollution levels. air quality forecasts and tips on how you can reduce your emissions can be found at www.Airnow.Gov. media contact...217 558 1536.

Official National Weather Service Weather Alert Statement

Air Quality Alert issued July 20 at 3:10AM CDT by NWS Lincoln IL

Event: Air Quality Alert
Message Type: Alert
Urgency: Unknown
Severity: Unknown
Certainty: Unknown
Affected Area: Knox; Stark; Peoria; Marshall; Woodford; Fulton; Tazewell; McLean; Schuyler; Mason; Logan; De Witt; Piatt; Champaign; Vermilion; Cass; Menard; Scott; Morgan; Sangamon; Christian; Macon; Moultrie; Douglas; Coles; Edgar; Shelby; Cumberland; Clark; Effingham; Jasper; Crawford; Clay; Richland; Lawrence

Wheather Alert Summary: The illinois environmental protection agency has issued an areawide air pollution action day for monday july 20th for portions of illinois. an areawide air pollution action day is declared when weather conditions are such that widespread ozone and or particulate levels are forecast to be at or above the unhealthy for sensitive groups (usg) category in all or nearly all illinois aqi forecast sectors. areas both inside and outside of the action day coverage area are likely to see smoke/particulates to a varying degree and duration today with smoke likely decreasing from southwest to northeast this afternoon. those with air quality concerns or anyone in illinois with outdoor plans are encouraged to check current nowcast readings or sign up for enviroflash alerts on airnow. gov. before going outside, checking the nowcast aqi will help identify periods of both poor and cleaner air quality regardless of the level of the daily 24-hour aqi forecast. aqi category guidance unhealthy for sensitive groups (usg) - members of sensitive groups may experience health effects. the general public is less likely to be affected. sensitive groups: make outdoor activities shorter and less intense. its ok to be active outdoors, but take more breaks. watch for symptoms such as coughing or shortness of breath. people with asthma: follow your asthma action plan and keep quick relief medicine handy. people with heart disease: symptoms such as palpitations, shortness of breath, or unusual fatigue may indicate a serious problem. if you have any of these, contact your health care provider. unhealthy - sensitive groups: avoid long or intense outdoor activities. consider rescheduling or moving activities indoors. everyone else: reduce long or intense activities. take more breaks during outdoor activities. media contact... illinois epa

Official National Weather Service Weather Alert Statement

Air Quality Alert issued July 20 at 3:05AM CDT by NWS Quad Cities IA IL

Event: Air Quality Alert
Message Type: Alert
Urgency: Unknown
Severity: Unknown
Certainty: Unknown
Affected Area: Jo Daviess; Stephenson; Carroll; Whiteside; Rock Island; Henry; Bureau; Putnam; Mercer; Henderson; Warren; Hancock; McDonough

Wheather Alert Summary: The illinois environmental protection agency has issued an areawide air pollution action day for today for portions of illinois. this is in addition to the ongoing areawide air pollution action day issued yesterday for the same areas. an areawide air pollution action day is declared when weather conditions are such that widespread ozone and or particulate levels are forecast to be at or above the unhealthy for sensitive groups (usg) category in all or nearly all illinois aqi forecast sectors. areas both inside and outside of the action day coverage area are likely to see smoke/pm2.5 to a varying degree and duration today and monday with smoke likely decreasing from southwest to northeast through the day monday. those with air quality concerns or anyone in illinois with outdoor plans are encouraged to check current nowcast readings or sign up for enviroflash alerts on airnow. gov. before going outside, checking the nowcast aqi will help identify periods of both poor and cleaner air quality regardless of the level of the daily 24-hour aqi forecast. aqi category guidance unhealthy for sensitive groups (usg) - members of sensitive groups may experience health effects. the general public is less likely to be affected. sensitive groups: make outdoor activities shorter and less intense. its ok to be active outdoors, but take more breaks. watch for symptoms such as coughing or shortness of breath. people with asthma: follow your asthma action plan and keep quick relief medicine handy. people with heart disease: symptoms such as palpitations, shortness of breath, or unusual fatigue may indicate a serious problem. if you have any of these, contact your health care provider. unhealthy - sensitive groups: avoid long or intense outdoor activities. consider rescheduling or moving activities indoors. everyone else: reduce long or intense activities. take more breaks during outdoor activities. air quality forecasts and current air quality can be found at www.Airnow.Gov media contact... illinois epa

Official National Weather Service Weather Alert Statement

Air Quality Alert issued July 20 at 2:15AM CDT by NWS St Louis MO

Event: Air Quality Alert
Message Type: Alert
Urgency: Unknown
Severity: Unknown
Certainty: Unknown
Affected Area: Greene; Macoupin; Montgomery; Fayette; Adams; Brown; Pike

Wheather Alert Summary: The illinois environmental protection agency in springfield illinois is forecasting unhealthy conditions for sensitive groups (usg) for fine particulates from wildfire smoke until midnight cdt tonight. active children and adults, especially people with pulmonary or respiratory disease such as asthma, should limit prolonged outdoor activity. residents are urged to reduce pollution levels. air quality forecasts and tips on how you can reduce your emissions can be found at www.Airnow.Gov. media contact...217 558 1536.

Official National Weather Service Weather Alert Statement

Air Quality Alert issued July 19 at 12:50PM CDT by NWS Chicago IL

Event: Air Quality Alert
Message Type: Alert
Urgency: Unknown
Severity: Unknown
Certainty: Unknown
Affected Area: Winnebago; Boone; McHenry; Lake; 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

Wheather Alert Summary: The illinois environmental protection agency has issued an areawide air pollution action day for monday july 20th for portions of illinois. this is in addition to the ongoing areawide air pollution action day in effect today july 19th for the same areas. an areawide air pollution action day is declared when weather conditions are such that widespread ozone and or particulate levels are forecast to be at or above the unhealthy for sensitive groups (usg) category in all or nearly all illinois aqi forecast sectors. areas both inside and outside of the action day coverage area are likely to see smoke/particulates to a varying degree and duration today and monday with smoke likely decreasing from southwest to northeast through the day monday. those with air quality concerns or anyone in illinois with outdoor plans is encouraged to check current nowcast readings or sign up for enviroflash alerts on airnow. gov. before going outside, checking the nowcast aqi will help identify periods of both poor and cleaner air quality regardless of the level of the daily 24-hour aqi forecast. aqi category guidance unhealthy for sensitive groups (usg) - members of sensitive groups may experience health effects. the general public is less likely to be affected. sensitive groups: make outdoor activities shorter and less intense. its ok to be active outdoors, but take more breaks. watch for symptoms such as coughing or shortness of breath. people with asthma: follow your asthma action plan and keep quick relief medicine handy. people with heart disease: symptoms such as palpitations, shortness of breath, or unusual fatigue may indicate a serious problem. if you have any of these, contact your health care provider. unhealthy - sensitive groups: avoid long or intense outdoor activities. consider rescheduling or moving activities indoors. everyone else: reduce long or intense activities. take more breaks during outdoor activities. media contact... illinois epa

Official National Weather Service Weather Alert Statement