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EF1 tornado in Crook County, Wyoming

Tornado June 29, 2018 · Crook County, Wyoming

EF1
Rating
18.7 mi
Whole path
200 yd
Path width

NOAA records this tornado county by county. Its path ran through Crook County → Lawrence County, South Dakota; the totals above are for the whole tornado.

EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 200 yards (0.11 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF1 means. On the Enhanced Fujita scale, EF1 is moderate damage: roofs badly stripped, mobile homes pushed off foundations or overturned, windows broken, consistent with estimated gusts of 86–110 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

The tornado developed southeast of Sundance and tracked generally to the east into South Dakota. The majority of damage occurred in wooded areas, with widespread snapped trees observed throughout the tornado path. Some structural damage was also observed southeast of Sundance just east of highway 585, near the beginning of the tornado's path. Based on the damage, the tornado was rated at an EF-1, with peak wind speeds estimated at 105 mph.

The wider storm

A supercell thunderstorm tracked east across central Campbell and southern Crook Counties, producing large hail and strong wind gusts. The storm became tornadic as it moved east-southeast of Sundance.

Began near Sundance (44.3206, -104.2870).

Source: NOAA Storm Events Database, event 765277. Narratives are written by the National Weather Service forecast office that issued the report.

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