Mercer County, Ohio FirstAlerts

Everything reported for Mercer County and within 40 miles of it, at every level. Warnings and official records name the county they apply to, which is the level most of them are issued at.

• Severe WeatherAug 31, 2026, 1:08 p.m. ETUnited States

  Heat Advisory Issued for Elkhart, Lagrange, Steuben and Other Areas

  The National Weather Service warns of heat index values up to 104 degrees from Tuesday afternoon through Wednesday evening for parts of northern Indiana and northwest Ohio.

• Severe WeatherAug 20, 2026, 6:53 p.m. ETOhio, United States

  Flood Warning Issued for Auglaize OH, Logan OH, and Shelby OH

  The National Weather Service warns of imminent flooding in Auglaize OH, Logan OH, and Shelby OH until Thursday morning.

• Severe WeatherAug 19, 2026, 5:14 p.m. ETOhio, United States

  Flood Watch Covers Wayne, Fayette and Union Counties in Indiana and 21 Ohio Counties Through Thursday Morning

  The watch record from National Weather Service Wilmington OH puts 24 county zones — from Connersville and Richmond's Wayne County east to Columbus, Dayton and Springfield — under a Flood Watch from 4 PM EDT Wednesday until 10 AM EDT Thursday.