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Dense Fog Advisory — Boone; McHenry; Kane; Kendall Severity: Moderate. Certainty: Likely. * 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.
The historical document was shared with another weather alert and cannot be attributed to this record. The original extract is preserved above; the exact alert link was not retained.