Clarion County, Pennsylvania FirstAlerts

Everything reported for Clarion 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 WeatherSep 3, 2026, 11:57 a.m. ETPennsylvania, United States

  Flood Watch Extended Through Thursday Evening for Mercer, Venango, Forest, Clarion, Jefferson PA

  The Flood Watch for Mercer, Venango, Forest, Clarion, and Jefferson counties now runs through Thursday evening, later than originally issued.

• Severe WeatherSep 1, 2026, 1:23 p.m. ETOhio, United States

  Heat Advisory in Effect Until 8 PM EDT Wednesday for Parts of Ohio, Pennsylvania, and West Virginia

  The National Weather Service has issued a Heat Advisory that runs from 8 AM to 8 PM EDT Wednesday, September 2, 2026.

• Severe WeatherAug 21, 2026, 2:10 a.m. ETUnited States

  Dense Fog Advisory in Effect for Harrison, Jefferson OH, Guernsey Until 9 AM EDT Friday

  The National Weather Service has issued a Dense Fog Advisory for portions of Ohio, Pennsylvania, and West Virginia, including Harrison, Jefferson OH, and Guernsey, with visibility of one quarter mile or less.