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EF0 tornado in St. Tammany Parish, Louisiana

Tornado October 27, 2021 · St. Tammany Parish, Louisiana

EF0
Rating
0.2 mi
Path length
25 yd
Path width
$2K
Damage as recorded
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 25 yards (0.01 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

NWS survey team found damage consistent with an EF-0 tornado. The Tornado moved onshore from Lake Pontchartrain and touched down just north of Mariners Blvd near North Causeway Blvd. It caused minor structural damage to a residential home, ripping off a tin roof. As the tornado tracked north, it damaged a small tree and tore off section of tin roofing from the Mariners Plaza. It then progressed northward, lifting just before reaching the intersection of East Causeway Approach and Monroe Street.

The wider storm

A warm front lifted north across the local area during the morning hours. This brought in a surge of warm and moist air. At the same time, mid level temperatures were dropping. That combination dramatically increased instability across the region. A line of thunderstorms and discrete cells ahead of the cold front developed and produced a few tornadoes, flash flooding, and damaging wind gusts.

Began near Lewisburg (30.3685, -90.0926).

Source: NOAA Storm Events Database, event 989886. Narratives are written by the National Weather Service forecast office that issued the report.

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