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EF0 tornado in Dakota County, Minnesota

Tornado September 20, 2018 · Dakota County, Minnesota

EF0
Rating
9.7 mi
Whole path
70 yd
Path width
$15K
Damage as recorded

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

EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 70 yards (0.04 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 NWS storm survey, plus drone and satellite footage, concluded that an EF0 tornado tracked 2.5 miles from east of Randolph, to the Goodhue County line, north of Highway 29. Most of the damage was associated with corn and soy bean fields flatten. Maximum width was 70 yards with estimated wind damage of 70 mph.

The wider storm

A violent outbreak of significant straight line winds, downburst winds, and multiple tornadoes occurred during the afternoon and early evening across southern Minnesota.

During the afternoon of Thursday, September 20th, a warm front lifted northward across far southern Minnesota. By the late afternoon, the warm front lied from just south of the Minnesota River, northeast to around the city of Wabasha.

Several thunderstorms developed in southwest Minnesota, and northwest Iowa. These storms moved into far southern Minnesota and quickly intensified and raced off to the east-northeast along, and north of this warm front.

Damage reports started to come into the office around 4 PM CST in Martin County, with multiple reports of significant damage from south of Mankato, to Waseca, then northeast through Waterville, Morristown, Owatonna, Faribault, Northfield, Cannon Falls, and Red Wing before moving into west central Wisconsin.

A long, and several day storm survey indicated at least XX confirmed tornadoes occurred in a widespread area of damaging winds from Martin County, northeast into west central Wisconsin.

The most destruction part of the storm occurred around Waterville, Morristown, Owatonna, Faribault and Cannon Falls. These cities all reported homes, buildings and warehouses either damaged or destroyed.

Hundreds of large, mature trees were uprooted or snapped along this path of destruction, including numerous trees up to 4 feet in diameter. In addition to the trees, structural damage was widespread including the Faribault airport where 80 planes were either damaged or destroyed as hangers were blown off their foundation.

The towns of Waterville and Faribault had the most homes damaged which was associated with EF2 tornado damage.

Two miles west of the Faribault airport, a resort area on Roberds Lake had upwords of 75 percent of the trees uprooted or blown down on the east side of the lake. Some of the trees landed on homes and split them in half.

Began near Randolph (44.5419, -92.9688).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 779375. Narratives are written by the National Weather Service forecast office that issued the report.

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