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EF0 tornado in Washington County, Oregon

Tornado October 29, 2018 · Washington County, Oregon

EF0

Rating

0.1 mi

Path length

20 yd

Path width

$100K

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 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

Multiple greenhouse structures were damaged at a farm on Thatcher Road. Witness accounts also confirmed a tornado. The tornado was likely on the ground for about 30 seconds to 1 minute.

The wider storm

A cold front which moved through on October 27th brought a much cooler air mass in aloft, which destabilized the atmosphere enough for thunderstorm development across the area on the 28th and 29th. There was enough vertical shear in the environment for a few of theses vigorous showers and thunderstorms to start to rotate, three of which went on to produce tornadoes.

Began near Forest Grove (45.5586, -123.1386).

Other tornadoes from the same storm system

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

EF0 Multnomah County EF0 Marion County

Source: NOAA Storm Events Database, event 789511. Narratives are written by the National Weather Service forecast office that issued the report.

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