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EF1 tornado in Freeborn County, Minnesota

Tornado June 17, 2010 · Freeborn County, Minnesota

EF1
Rating
2.2 mi
Path length
220 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 220 yards (0.12 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

A tornado developed just to the southeast of the intersection of County Roads 30 and 35, or about 1/4 mile southeast of where the Hollandale EF-3 had dissipated. This new tornado tracked northeast, hitting three farmsteads just east of the intersection of county roads 30 and 35. Numerous trees were snapped and a shed and other outbuildings were destroyed. For the latter portion of its track, the tornado moved through fields and groves, with more crop damage and broken trees. Photos and video recorded by storm chaser.

The wider storm

Several strong storms developed in west-central Minnesota during the mid afternoon hours of June 17th.

These storms quickly become severe and produced softball size hail northwest of Alexandria and a tornado near Leaf Valley that became the EF-4 that moved through Wadena, Minnesota.

By the late afternoon, numerous thunderstorms developed across southern Minnesota along the leading edge of extreme instability.

Numerous funnel cloud reports and a few brief tornado touchdowns were noted prior to 5 pm, but once the low level shear (0-1 km) increased significantly from 15 knots, to over 35 knots, strong tornadoes developed along the Iowa border.

These storms along the Iowa border produced a series of long-lived tornadoes near Albert Lea, Minnesota. Very large hail also accompanied some tornadoes along with flash flooding.

Began near Newry (43.8103, -93.1627).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 238658. Narratives are written by the National Weather Service forecast office that issued the report.

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