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EF1 tornado in Calhoun County, Iowa

Tornado April 16, 2024 · Calhoun County, Iowa

EF1
Rating
5.2 mi
Path length
75 yd
Path width
$12K
Damage as recorded
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 75 yards (0.04 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

Video from storm chaser provided footage for entire life cycle of tornado. The tornado formed just northwest of the hamlet of Rands and produced EF1 damage to telephone poles. The tornado traveled almost due north along Quinton Avenue and passed east of the Rockwell City Correctional Faciliity. It crossed old Highway 20 near Quinton Avenue and passed through a farmstead with only minor damage. The tornado eventually lifted after passing over a railroad.

The wider storm

A strong low pressure brought multiple rounds of strong to severe thunderstorms to portions of central Iowa on Tuesday, April 16th, 2024. Elevated thunderstorms developed overnight and lingered into the morning across the area, remaining sub severe. This was followed by a second line of storms that lifted into the area by late morning. This line produced a few tornadoes in southwest to central Iowa. This was then followed by a third round of thunderstorms, more discrete in storm mode, that produced a few more tornadoes in northwest portions of Iowa. At least 8 short-lived tornadoes touched down, some causing damage in portions of central Iowa from late morning through the afternoon. A few of the severe thunderstorms also produced hail of 1 to 2 inches in diameter and wind gusts of 50-60 mph. Environmental winds behind the dry line were quite strong as well, occasionally gusting in excess of 50-55 mph.

Began near Rands (42.3355, -94.5927).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 1169948. Narratives are written by the National Weather Service forecast office that issued the report.

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