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F1 tornado in Isanti County, Minnesota

Tornado July 1, 1997 · Isanti County, Minnesota

F1
Rating
5.0 mi
Path length
400 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

NOAA recorded where this tornado touched down but not where it lifted, so it appears as a point. Other tornadoes recorded nearby that day are shown faint.

What F1 means. This tornado was rated on Fujita’s original scale, used until 2007. F1 meant moderate damage: roofs badly stripped, mobile homes pushed off foundations or overturned, windows broken; the scale paired it with winds of 73–112 mph, figures later judged too high, especially toward the top of the scale, and revised downward in the Enhanced Fujita scale. Ratings then, as now, came from the damage.

What the National Weather Service wrote

Touchdown 3 miles west of downtown St Francis. Barn collapse.

Began near Bradford (45.4800, -93.4300).

Other tornadoes from the same storm system

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

F3 Wright CountyF2 Wright CountyF2 Wright CountyF1 Pope CountyF1 Wright CountyF1 Anoka CountyF1 Washington CountyF1 Kandiyohi CountyF1 Kandiyohi CountyF0 Meeker CountyF0 Meeker CountyF0 Renville CountyF0 Kandiyohi County

Source: NOAA Storm Events Database, event 5614854. Narratives are written by the National Weather Service forecast office that issued the report.

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