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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.

4 reports on this incident · first at Sep 3, 2026, 11:22 a.m. ET

By AI ReporterWritten Sep 3, 2026, 11:57 a.m. ET
The National Weather Service in Pittsburgh has extended a for portions of northwest and western Pennsylvania through Thursday evening, September 3, 2026. The , which was issued at 11:15 a.m. EDT, now runs until midnight Thursday night, a longer window than first announced. The covers Mercer, Venango, Forest, Clarion, and Jefferson counties, including the cities of Tionesta, Brookville, Franklin, Clarion, Punxsutawney, Hermitage, Sharon, Grove City, and Oil City. Excessive rainfall may cause flash flooding in rivers, creeks, streams, and other low-lying and flood-prone locations, as well as in poor drainage and urban areas. Officials advise monitoring later forecasts and being prepared to take action should Flash Flood Warnings be issued.

Earlier reports

  1. Sep 3, 2026, 11:54 a.m. ET

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

    The National Weather Service Pittsburgh PA has issued a Flood Watch for portions of northwest and western Pennsylvania, in effect from 11:15 a.m. Thursday, September 3, 2026, through midnight Thursday night.

    The watch covers Mercer, Venango, Forest, Clarion, and Jefferson PA counties, including the cities of Tionesta, Brookville, Franklin, Clarion, Punxsutawney, Hermitage, Sharon, Grove City, and Oil City.

    Flash flooding caused by excessive rainfall is possible. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas.

    Residents should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

  2. Sep 3, 2026, 11:24 a.m. ET

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

    The National Weather Service in Pittsburgh has issued a Flood Watch for Mercer, Venango, Forest, Clarion, and Jefferson counties in Pennsylvania, in effect from 11:15 a.m. Thursday, September 3, 2026, through midnight Thursday night. The watch includes the cities of Tionesta, Brookville, Franklin, Clarion, Punxsutawney, Hermitage, Sharon, Grove City, and Oil City.

    According to the Weather Service, flash flooding caused by excessive rainfall is possible. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations, and flooding may occur in poor drainage and urban areas.

    The Weather Service advises residents to monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

  3. Sep 3, 2026, 11:22 a.m. ETFirst report

    National Weather Service Extends Flood Watch for Mercer, Venango, Forest, Clarion, Jefferson Through Late Monday Night

    The National Weather Service in Pittsburgh has issued a Flood Watch for portions of northwest and western Pennsylvania, in effect from 11:15 a.m. Thursday, September 3, 2026, until midnight Thursday night.

    The watch covers Mercer, Venango, Forest, Clarion, and Jefferson counties, including the cities of Tionesta, Brookville, Franklin, Clarion, Punxsutawney, Hermitage, Sharon, Grove City, and Oil City.

    According to the advisory, excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations, as well as poor drainage and urban areas. Residents are advised to monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

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Revision history

  1. Version 13 Sept 2026, 15:57current

    First published.

  2. Version 13 Sept 2026, 15:24current

    First published.

  3. Version 13 Sept 2026, 15:22current

    First published.

  4. Version 13 Sept 2026, 15:54current

    First published.

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