Heat Advisory: Greene; Macoupin; Montgomery; Bond; Fayette; Marion; Adams; Brown; Pike; Calhoun; Jersey; Knox; Lewis; Shelby; Marion; Monroe; Ralls; Pike; Boone; Audrain; Moniteau; Cole; Osage; Callaway; Montgomery; Lincoln; Gasconade; 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; Boone; Audrain; Moniteau; Cole; Osage; Callaway; Montgomery; Lincoln; Gasconade; Crawford; Washington; St. Francois; Iron; Madison; Reynolds Severity: Moderate. Certainty: Likely. * WHAT...Heat index values up to 105 expected. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, northeast, and southeast Missouri. * WHEN...From noon today to midnight CDT Thursday Night. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.