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EF0 tornado in Chisago County, Minnesota

Tornado June 17, 2010 · Chisago County, Minnesota

EF0
Rating
8.1 mi
Whole path
25 yd
Path width
2
Injuries
$293K
Damage as recorded

NOAA records this tornado county by county. Its path ran through Chisago County → Pine County → Burnett County, Wisconsin → Burnett County, Wisconsin; the totals above are for the whole tornado.

EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 25 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

A tornado touched down in extreme northern Chisago County, uprooting trees and breaking large branches. It then moved into Pine County, where it intensified and produced EF-2 damage, and eventually tracked into Burnett County, Wisconsin.

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 Rush City (45.7277, -92.8743).

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 238666. Narratives are written by the National Weather Service forecast office that issued the report.

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