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EF0 tornado in Jefferson County, Alabama

Tornado March 17, 2021 · Jefferson County, Alabama

EF0
Rating
3.5 mi
Path length
660 yd
Path width
1
Injury
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 660 yards (0.38 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

National Weather Service meteorologists surveyed damage in northern Jefferson County and determined that it was consistent with an EF0 tornado, with maximum winds near 85 mph. A tornado touched down near Sutherland Road on the west side of Interstate 65 and tracked northeast crossing Interstate 65 and Highway 31. Damage consisted of downed trees with relatively minor structural damage. However, there were several instances of significant residential and vehicle damage from fallen trees. One person was taken to the hospital with non-life-threatening injuries.

The wider storm

An active southern jet stream set-up across the southern United States during the middle of March. Several short-wave troughs became negatively tilted as each one traversed across Texas and towards Alabama. This resulted in a single hail event one Monday, March 15, and significant tornado outbreak on Wednesday, March 17. Many supercells began to develop across Central Alabama by midday Wednesday and continued into the evening hours before a squall line moved through the state. Sufficient instability and strong wind shear produced conditions favorable for tornadoes to develop. The event consisted of twenty-one tornadoes in the NWS Birmingham forecast area.

Began near Mt Olive (33.6619, -86.8534).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 945111. Narratives are written by the National Weather Service forecast office that issued the report.

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