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F0 tornado in Grundy County, Illinois

Tornado April 20, 2004 · Grundy County, Illinois

Rating

2.0 mi

Path length

20 yd

Path width

$76K

Damage as recorded

EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 20 yards (0.01 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What F0 means. This tornado was rated on Fujita’s original scale, used until 2007. F0 meant light damage: shingles and siding peeled, gutters torn, branches broken; the scale paired it with winds of 40–72 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

The tornado struck an industrial complex. A wastewater treatment building was destroyed, walls were blown out and structural beams were bent, at Tabler Road, south of Route 6. There was damage to overhead doors and an air handling unit was torn from a roof of a building on the east side of Tabler Road. Further east there was damage to walls and roof of an outbuilding. Antennas was blown down at the fire station on Route 6.

Began near Minooka (41.4000, -88.3333).

Other tornadoes from the same storm system

10 more tornadoes the National Weather Service filed under this storm episode.

F3 La Salle County 8 dead F2 Kankakee County F1 La Salle County F1 Kankakee County F1 Will County F0 La Salle County F0 Ford County F0 Ford County F0 Kankakee County F0 Will County

Source: NOAA Storm Events Database, event 5390780. Narratives are written by the National Weather Service forecast office that issued the report.

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