Heat Advisory: Greene; Macoupin; Montgomery; Bond; Fayette; Marion; Adams; Brown; Pike; Calhoun; Jersey; Knox; Lewis; Shelby; Marion; Monroe; Ralls; Pike; Audrain; Lincoln; Crawford; Washington; St. Francois; Iron; Madison; Reynolds

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Heat Advisory — Greene; Macoupin; Montgomery; Bond; Fayette; Marion; Adams; Brown; Pike; Calhoun; Jersey; Knox; Lewis; Shelby; Marion; Monroe; Ralls; Pike; Audrain; Lincoln; Crawford; Washington; St. Francois; Iron; Madison; Reynolds Severity: Moderate. Certainty: Likely. * WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 105. For the Heat Advisory, heat index values up to 102 expected. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, northeast, and southeast Missouri. * WHEN...For the Extreme Heat Warning, until 10 PM CDT Friday. For the Heat Advisory, from 10 PM Friday to 8 PM CDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.