Active Weather Alerts
Dense Fog Advisory
Issued: 8:02 AM Jul. 27, 2026 – National Weather Service
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING... ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM CDT THIS MORNING... * WHAT...For the Heat Advisory, peak heat index values up to 100 to 110 degrees expected. For the Dense Fog Advisory, visibility less than one quarter mile in dense fog. * WHERE...Boone, Kane, Kendall, and McHenry Counties. * WHEN...For the Heat Advisory, until 9 PM CDT this evening. For the Dense Fog Advisory, until 8 AM CDT this morning. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Low visibility could make driving conditions hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. If driving, slow down, use your headlights, and leave plenty of distance ahead of you. &&
Heat Advisory
Issued: 8:02 AM Jul. 27, 2026 – National Weather Service
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING... ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM CDT THIS MORNING... * WHAT...For the Heat Advisory, peak heat index values up to 100 to 110 degrees expected. For the Dense Fog Advisory, visibility less than one quarter mile in dense fog. * WHERE...Boone, Kane, Kendall, and McHenry Counties. * WHEN...For the Heat Advisory, until 9 PM CDT this evening. For the Dense Fog Advisory, until 8 AM CDT this morning. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Low visibility could make driving conditions hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. If driving, slow down, use your headlights, and leave plenty of distance ahead of you. &&
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