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EF1 tornado in Jefferson County, Missouri

Tornado May 31, 2013 · Jefferson County, Missouri

EF1
Rating
12.4 mi
Path length
200 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 200 yards (0.11 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 in extreme western Jefferson County near Highway NN and Apke Lane. It moved to the east and most of the damage consisted of snapped and downed trees and broken tree limbs. In the Byrnes Mill area several mobile homes were damaged from fallen trees. In Scotsdale, several school buildings at Our Lady Queen of Peace Church suffered minor damage. The tornado lifted and dissipated west of Rustic Trails Drive, around 2.7 miles east of Byrnes Mill. The tornado path length was 12.4 miles and the max path width was 200 yards. The damage was rated EF1 with max wind speeds of 100 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 Byrnesville (38.4013, -90.7322).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 460727. Narratives are written by the National Weather Service forecast office that issued the report.

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