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EF0 tornado in Foster County, North Dakota

Tornado July 17, 2011 · Foster County, North Dakota

EF0
Rating
1.5 mi
Path length
30 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 30 yards (0.02 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

This tornado touched down in the open country. There were no impacts to structures and so no reports of damage.

The wider storm

A prolonged severe weather event materialized July 17th with an extremely unstable atmosphere present and supportive mid level dynamics. The first wave of storms occurred from the mid morning through the early afternoon hours as a short wave mid level impulse crested the central plains upper ridge across North Dakota. Storms intensified ahead of this feature, prompting the issuance of several severe thunderstorm and tornado warnings. Numerous reports of large hail and severe thunderstorm wind gusts were received. In addition, 3 confirmed tornadoes occurred with this first wave.

The second wave occurred from the mid afternoon through the mid evening hours. This mainly consisted of one supercell thunderstorm. Severe weather reports included very large hail, strong winds, and two confirmed tornadoes. This included an EF3 tornado in Lamoure County.

Began near Juanita (47.5000, -98.7229).

Other tornadoes from the same storm system

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

EF3 La Moure CountyEF0 Wells CountyEF0 Foster CountyEF0 Dickey County

Source: NOAA Storm Events Database, event 331467. Narratives are written by the National Weather Service forecast office that issued the report.

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