Weather officials say a tractor that was carried away in a tornado last week near the Montana-South Dakota state line has yet to be found.
The National Weather Service says last Thursday's storm spawned at least five tornadoes in rural Carter County, Montana, and Harding County, South Dakota.
The most damaging tornado received an EF-3 rating with winds estimated at 136 mph. It traveled more than 3 miles from Montana into South Dakota, snapping trees and destroying a home and a shed.
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As many as five tornadoes may have been produced by a violent Thursday night storm that swept through southeastern Montana and northwestern So…