F1 tornado — Warren County, Pennsylvania

F1 tornado in Warren County, Pennsylvania

Tornado July 9, 1999 · Warren County, Pennsylvania

Rating

3.0 mi

Path length

100 yd

Path width

$150K

Damage as recorded

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The path drawn at its surveyed width of 100 yards (0.06 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What F1 means. This tornado was rated on Fujita’s original scale, used until 2007. F1 meant moderate damage: roofs badly stripped, mobile homes pushed off foundations or overturned, windows broken; the scale paired it with winds of 73–112 mph, figures later judged too high, especially toward the top of the scale, and revised downward in the Enhanced Fujita scale. Ratings then, as now, came from the damage.

What the National Weather Service wrote

A small tornado touched down on State Route 3005 just across the Allegheny River south of Tidioute. The storm tracked east paralleling the road for about three miles crossing Red House Hill Road near McKean Corners. Damage was mostly to trees with one home having a chimney damaged. A broad area of downburst damage associated with the storm extended south from Red House Hill Road all the way to the Pennsylvania border along Route 3005 (Kelly Hill Road). Hundreds of trees were down, power poles were snapped off, and many hunting and recreational cabins in the area had some structural damage due to falling trees. This was a low F1 event with winds probably best estimated on the order of 80 to 90 mph. In addition, trees were downed in many locations of Warren County.

Other tornadoes from the same storm system

Source: NOAA Storm Events Database, event 5710403. Narratives are written by the National Weather Service forecast office that issued the report.

F1 tornado in Warren County, Pennsylvania

What the National Weather Service wrote

Other tornadoes from the same storm system

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