Yikes - don't mess with Mother Nature

From Missoula, Montana station KECI:

5-ton tractor still missing after tornado touches down
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 tornados 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 (218 kph). It traveled more than 3 miles (5 kilometers) from Montana into South Dakota, snapping trees and destroying a home and a shed.

And an EF-3 is not the biggest they get. The Enhanced Fujita Scale goes up to EF-5. There is no EF-6