F0 tornado in Ada County, Idaho

Tornado April 20, 1997 · Ada County, Idaho

Rating

0.2 mi

Path length

30 yd

Path width

EF0EF1EF2EF3EF4EF5Unrated

NOAA recorded where this tornado touched down but not where it lifted, so it appears as a point. 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

On the morning of April 20, a strong cold front moved across Southern Idaho . This cold front produced strong thunderstorms in the Boise area which spawned a short lived weak tornado. The tornado moved through a subdivision on the outskirts of Boise . Six houses suffered roof damage,fences were torn up and a trampoline was hurled 5 city blocks.

Began near Boise Terminal Arpt (43.6000, -116.2800).

Source: NOAA Storm Events Database, event 5600230. Narratives are written by the National Weather Service forecast office that issued the report.

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