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EF0 tornado in Clarion County, Pennsylvania

Tornado June 9, 2025 · Clarion County, Pennsylvania

EF0
Rating
0.2 mi
Path length
25 yd
Path width
$8K
Damage as recorded
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 25 yards (0.01 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF0 means. On the Enhanced Fujita scale, EF0 is light damage: shingles and siding peeled, gutters torn, branches broken, consistent with estimated gusts of 65–85 mph. The rating comes from a survey of the worst damage after the storm, not from a wind measurement, so it says as much about what the tornado hit as about how strong it was.

What the National Weather Service wrote

A mature mesocyclone developed over Clarion County at roughly 5pm

on June 9th, 2025. Mid level rotation intensified as the storm

grew stronger, until eventually, a brief tornado touched down near

Bush Run Road in Waterson, PA in Clarion County. Most damage was

to hardwood trees. One tree fell on a garage, collapsing the

structure. Winds were observed in a narrow swath and trees fell in

a convergent pattern for roughly a quarter of a mile. The damage

was consistent with a brief EF0 tornado lasting only a couple of

minutes.

The wider storm

An organized line of convection crossed the region, with 40-45 knots of unidirectional shear out of the southwest. This along with 100-1500 J/kg of surface-based CAPE resulted in severe weather across the region.

Began near Waterson (41.1774, -79.3066).

Source: NOAA Storm Events Database, event 1279119. Narratives are written by the National Weather Service forecast office that issued the report.

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