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EF1 tornado in Franklin County, Missouri

Tornado May 31, 2013 · Franklin County, Missouri

EF1
Rating
10.0 mi
Path length
550 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 550 yards (0.31 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 touched down just west of Highway UU, around 3.5 miles southwest of Union. Most of the damage consisted of snapped and downed trees and broken tree limbs. Five homes located along Indian Prairie Lane between Union and St. Clair suffered minor roof damage. The tornado lifted and dissipated just south of the intersection of Meramec Terrace Road and Indian Acres Road, around 3.4 miles southwest of Robertsville. The tornado path length was 10 miles with a max path width of 550 yards. The damage was rated EF1 with max wind speeds of 105 MPH.

The wider storm

Storms developed along an outflow boundary that was laid out along the I-70 corridor. The storms produced wind damage, large hail as well as 9 tornadoes. Two of the tornadoes were rated EF3 as they moved through the St. Louis metro area. Also, heavy rain fell causing flash flooding in some locations, which persisted into the early morning hours of June 1st.

Began near Jeffriesburg (38.4095, -91.0509).

Other tornadoes from the same storm system

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

EF3 St. Louis CountyEF3 St. Charles CountyEF1 Jefferson CountyEF0 Montgomery CountyEF0 Montgomery County

Source: NOAA Storm Events Database, event 460726. Narratives are written by the National Weather Service forecast office that issued the report.

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