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EF2 tornado in Carter County, Montana

Tornado June 28, 2018 · Carter County, Montana

EF2
Rating
6.6 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 EF2 means. On the Enhanced Fujita scale, EF2 is considerable damage: roofs torn off well-built houses, mobile homes destroyed, large trees snapped or uprooted, consistent with estimated gusts of 111–135 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

The tornado was on the ground for 7 miles (approximately 24 minutes) from south of Capitol, Montana northeast into South Dakota. In Montana, the tornado path was 3 miles long with a width of 200 yards. Damage ranged from EF-1 at the initial touchdown, increasing to EF-2 just before the South Dakota border. Large tree limbs were downed and trees snapped. The damage became more widespread as the path approached the Little Missouri River.

The maximum wind speed during the life of the tornado was 136 mph (EF-3). The tornado ranged from 200 yards wide in Montana to a half mile wide in South Dakota.

The wider storm

During the late afternoon and evening hours on June 28th, severe weather broke out across much of the Billings Forecast Area. The most severe weather occurred across southeast Montana, mainly Carter County where golf ball size and larger hail, straight line winds 70-80 mph and four tornadoes were reported.

Around 7:17 PM, the first tornado was spotted crossing SR 323 in Carter County about 12 miles north of Albion in the Finger Butte Area. This tornado was spotted by a rancher about a mile to the south. His property sustained straight line wind damage on the south side of the storm, including trees uprooted, a barn roof blown off, a shed destroyed, and a horse trailer flipped over. This wind damage was consistent with 70-80 mph winds. This tornado left no trace along SR 323 and moved through open terrain before lifting. This tornado has been assigned a rating of EF-0 since no damage markers could be observed. Storm chasers following this storm as it pushed east through rural areas of Carter County noticed two additional brief tornado touchdowns. These tornadoes were in extremely rural and open areas with no road access to do damage surveys.

At approximately 8:06 PM, another tornado touched down just east of Camp Crook Road 4 miles south of Capitol, MT. In its initial phases, this tornado skipped along the ground, as confirmed by chaser video, producing sporadic snapped trees and downed limbs consistent with winds 80-90 mph (EF-0 to EF-1).

Damage survey and eye witness accounts confirm the tornado initially moved north-north-east along the Little Missouri River. As it approached the river it intensified to 120 mph (EF-2) producing an increasingly wider swath of snapped trees several hundred yards wide. The tornado started to turn more to the east at this time, moving on a northeasterly track as it crossed the Little Missouri and moved across the Montana/South Dakota border.

The tornadoes stayed mostly over rural areas producing limited damage. The damage that has been surveyed has ranged from EF-0 to EF-3. The most significant damage appears to have occurred with a tornado that touched down south of Capitol, Montana and moved into South Dakota. Damaged observed just across the border in South Dakota is consistent with an EF-3 tornado rating, with winds estimated at 136 mph. Damage observed includes one home destroyed, heavy hay bales moved, along with the debarking of some trees.

Began near Capitol (45.3753, -104.0813).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 762225. Narratives are written by the National Weather Service forecast office that issued the report.

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