410 
NOUS43 KUNR 301659
PNSUNR
SDZ001-010500-

Public Information Statement
National Weather Service Rapid City SD
1059 AM MDT Sat Jun 30 2018

...NWS DAMAGE SURVEY FOR 6/28/2018 TORNADO SOUTH OF CAMP CROOK... 

On the evening of June 28, 2018, a tornadic supercell crossed the
state line from MT into SD, producing a strong tornado over
western portions of Harding County. 

The tornado crossed the MT/SD state line near Forty-eight Mile
Creek around 8:20 PM based upon video evidence and eyewitness 
reports. It traveled northeastward, crossing South Camp Crook 
Road before dissipating near Sagebrush Draw at 8:28 PM. 

West of Camp Crook Road, the 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 Road, several hundred yards of 
fence were either flattened or littered with debris, and 
widespread sagebrush destruction was observed. East of Camp Crook 
Road 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 west. While much of 
the damage was consistent with an EF-1 or EF-2 tornado, the most 
significant damage on either side of Camp Crook Road was 
consistent with an EF-3 tornado.

Rating: EF-3
Estimated peak wind: 136 mph 
Path length /Statute/: Estimated 3.63 miles 
Path width /Maximum/: 900 yards 
Fatalities: 0 
Injuries: 0

Start date:             Jun 28, 2018 
Start time:             820 PM MDT
Start location:         10 south-southwest of Camp Crook
Start Lat/Lon:          45.4092/-104.0405

End date:               Jun 28, 2018
End time:               828 PM MDT
End location:           7 south of Camp Crook
End_lat/lon:            45.4475/-103.9904

EF Scale: The Enhanced Fujita Scale Classifies 
Tornadoes into the following categories.

EF0...Weak......65 to 85 mph
EF1...Weak......86 to 110 mph
EF2...Strong....111 to 135 mph
EF3...Strong....136 to 165 mph
EF4...Violent...166 To 200 mph
EF5...Violent...>200 mph

NOTE:
The information in this statement is PRELIMINARY and subject to
change pending final review of the event and publication in
NWS Storm Data. 

$$