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Severe Thunderstorms, Heavy Rainfall, And Flooding Possible Over The Plains; Typhoon Bualoi Approaches The CNMI

A storm system will bring the potential for severe thunderstorms capable of damaging winds, large hail, and isolated tornadoes over the south central U.S. into Monday. Heavy rainfall may also lead to flash flooding. The system will shift toward the eastern U.S. on Tuesday. Over the western Pacific, Typhoon Bualoi will intensify and impact the northern Marianna Islands over the next couple of days. Read More >

Overview

Large tornado near Camp Crook, SD (photo by Roger Hills)During the evening of June 28, 2018, a storm produced several tornadoes across Carter County, MT and Harding County, SD. Information is still being compiled, and the report will be completed in several days. Updated information as of July 2nd indicates that four tornadoes occurred across Harding County. Four additional tornadoes occurred in Carter County, Montana

The first tornado crossed the Montana-South Dakota state line near Forty-eight Mile Creek, approximately 10 miles south-southwest of Camp Crook around 8:20 PM MDT based upon video evidence and eyewitness reports. It traveled northeastward, crossing South Camp Crook Rd before dissipating near Sagebrush Draw at 8:30 PM.

West of South Camp Crook Rd, the first tornado produced considerable tree and structural damage, including debarking of some trees, collapse of exterior walls of a home, and complete destruction of some outbuildings. Based on this damage, winds were estimated at 136 mph. The tornado also lofted and destroyed some farm machinery, including a 5-ton tractor that has yet to be found. As the tornado crossed Camp Crook Rd, several hundred yards of fence were either flattened or littered with debris, and widespread sagebrush destruction was observed. East of Camp Crook Rd near Hawk Creek, a large farm outbuilding was destroyed, and its foundation was extracted from the ground and broken apart. A tractor tire found on this property may have been part of the tractor lost approximately two miles to the southwest. While much of the damage was consistent with an EF-1 or EF-2 tornado, the most significant damage was consistent with an EF-3 tornado.

The next two tornadoes occurred over mainly rural areas of Harding County southeast of Camp Crook and southwest of Buffalo. Their times of occurrence, along with approximate start and end points, were determined via eyewitness accounts, video/photographic evidence, and radar data. Though delayed reports of structural damage associated with tornado #2 were received a few days after the event, the strengths of these tornadoes are unknown.

The final tornado developed just south of Highway 20 near mile marker 17 around 9:10 PM, where it subsequently snapped power poles and trees near a residence. A farm outbuilding was also severely damaged, with collapse of most exterior walls. Based on video evidence, the tornado then continued northward across rural areas northwest of Buffalo and crossed Clanton Rd before dissipating at 9:26 PM.

Above: Photo of tornado by Camp Crook by Roger Hill.

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