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LINWOOD, Kan. — The tornado that caused major damage to the town of Linwood, Kansas, on Tuesday night has been classified as an EF-4 by the National Weather Service.

The severe thunderstorm first developed near Emporia, Kansas. Then an EF-3 tornado first developed just after 6 p.m. northwest of Baldwin City in Douglas County, the agency said.

The tornado began tracking to the northeast and strengthened in the river bottoms. From there it grew to an EF-4 tornado in southern Leavenworth County where it struck Linwood, the NWS said.

The tornado went on for over 31 miles before ending at 7 p.m. west of Bonner Springs. The EF-4 tornado was reported to be 1 mile wide and have an estimated peak wind of 170 mph.

Eighteen injuries have been reported with this storm with 15 in Douglas County and three in Leavenworth County.

The Kansas Department of Transportation said K-32 is expected to be closed from 158th Street to 222nd Street until at least Friday due to debris and power lines on the roadway.