Flash Flood Warning Issued for Armstrong and Clarion Counties Following Ice Jam Break

Alert Details

The National Weather Service in Pittsburgh has issued a Flash Flood Warning for northwestern Armstrong County and southwestern Clarion County in west central Pennsylvania. The warning was triggered by reports of an ice jam break on the Allegheny River.

Affected Areas

The warning impacts the following geographic regions:

• Northwestern Armstrong County in west central Pennsylvania
• Southwestern Clarion County in west central Pennsylvania

Specific downstream towns identified in the path of the flooding include Parker, Monterey, and West Monterey.

What You Should Do

Residents and motorists in the warning area should adhere to the following safety instructions:

• Turn around, don’t drown: Do not attempt to drive on flooded roads. Most flood-related fatalities occur in vehicles.
• Stay away from river banks: River banks and culverts can become unstable and unsafe during flash flooding events.
• Remain vigilant: Be aware of your surroundings and avoid areas near the river downstream of the break.

Expected Conditions

At 2:29 PM EST, gauge reports indicated that an ice jam on the Allegheny River at Foxburg broke. This break is causing immediate flash flooding in areas near and downstream of the jam location. The primary hazard is flash flooding resulting directly from the sudden release of water and ice.

Timeline

The Flash Flood Warning is effective as of 2:29 PM EST on February 20, 2026, and is currently set to expire at 5:30 PM EST on the same day.