090  
NOUS45 KCYS 312359  
PNSCYS  
NEZ002-003-019>021-054-055-095-096-WYZ101>119-011200-  
 
PUBLIC INFORMATION STATEMENT  
NATIONAL WEATHER SERVICE CHEYENNE, WY  
559 PM MDT TUE JUL 31 2018  
 
...NWS DAMAGE SURVEY FOR 28 JULY TORNADO EVENT IN SOUTHERN  
CONVERSE COUNTY, WY...  
 
...NWS CHEYENNE AND CONVERSE COUNTY EMA GROUND SURVEY TEAM  
FOUND EVIDENCE OF TWO TORNADOES SOUTH OF DOUGLAS...  
   
OVERVIEW
 
 
THE FOLLOWING IS PRELIMINARY RESULTS FROM THE ASSESSMENT OF  
DAMAGE ASSOCIATED WITH TWO TORNADOES THAT AFFECTED AREAS SOUTH OF  
DOUGLAS, WY ON THE 28TH OF JULY 2018 BETWEEN 4 PM AND 430 PM MDT.  
NWS TEAM MEMBERS CONTINUE TO GATHER DATA ASSOCIATED WITH THESE  
TORNADOES. ADDITIONAL CHANGES TO PATH LENGTH AND INTENSITY OF  
THESE TORNADOES ARE POSSIBLE OVER THE NEXT FEW DAYS AS MORE  
INFORMATION BECOMES AVAILABLE.  
   
WAGONHOUND ROAD TORNADO
 
 
RATING: EF-3  
ESTIMATED PEAK WIND: 136-165 MPH  
PATH LENGTH (STATUTE): 4.5 MILES  
PATH WIDTH (MAXIMUM): 350 YARDS  
FATALITIES: 0  
INJURIES: 0  
 
START DATE: JULY 28 2018  
START TIME: 400 PM MDT (APPROX)  
START LOCATION: 9 MILES SOUTHWEST OF DOUGLAS, WY  
START LAT/LON: 42.6452/-105.5134  
 
END DATE: JULY 28 2018  
END TIME: 415 PM MDT (APPROX)  
END LOCATION: 12 MILES SOUTH-SOUTHWEST OF DOUGLAS, WY  
END_LAT/LON: 42.5841/-105.4862  
 
THE FIRST OBSERVED EVIDENCE FROM THE FIRST TORNADO WAS NEAR  
RATTLESNAKE HILL JUST NORTH OF WAGONHOUND ROAD. THE TORNADO MOVED  
TO THE SOUTH AND QUICKLY GREW STRONGER. NWS CONTINUES TO  
INVESTIGATE SOME VIDEO EVIDENCE THAT THE TORNADO MAY HAVE BEEN ON  
THE GROUND PRIOR TO RATTLESNAKE HILL. THE TORNADO SNAPPED SEVERAL  
TREES AND POWER POLES ALONG WAGONHOUND ROAD, AND BLEW SEVERAL  
LARGE ROLLS OF HAY NEARLY 300 YARDS FROM A LARGE HAY BALE STACK.  
THE TORNADO GREW STRONGER AS IT MOVED SOUTH TOWARDS A RANCH,  
REACHING EF-3 INTENSITY AS IT MOVED THROUGH THE BARN AND RESIDENCE  
PORTION OF THE RANCH DESTROYING SEVERAL BUILDINGS AND DOING  
SIGNIFICANT DAMAGE TO THE RANCH HOUSE. THE RANCH HOUSE HAD LARGE  
SECTIONS OF ROOF STRUCTURE REMOVED, WHILE A QUONSET HUT TRACTOR  
STORAGE AREA JUST WEST OF THE HOUSE WAS COMPLETELY DESTROYED. TWO  
LARGE UTILITY TRAILERS (WEIGHING SEVERAL THOUSAND POUNDS) WERE  
LOFTED AND (AT THE TIME OF THE SURVEY) HAD NOT BEEN LOCATED WITH  
THE EXCEPTION OF 1 AXEL SET. LARGE COTTONWOOD TREES NEAR THE RANCH  
HOUSE WERE COMPLETELY STRIPPED OF ALL VEGETATION WITH JUST THE  
LARGEST LIMBS NEAR THE CENTER OF THE TREES REMAINING. THE TORNADO  
CONTINUED SOUTH BEFORE LIFTING IN THE VICINITY OF POISON LAKE.  
START/END AND LOCATIONS/TIMES OF THIS TORNADO ARE ESTIMATED FROM  
EYEWITNESS ACCOUNTS AND RADAR DATA.  
   
ESTERBROOK ROAD TORNADO
 
 
RATING: EF-1  
ESTIMATED PEAK WIND: 86-110 MPH  
PATH LENGTH/STATUTE/: 2 MILES  
PATH WIDTH /MAXIMUM/: 150 YARDS  
FATALITIES: 0  
INJURIES: 0  
 
START DATE: JULY 28 2018  
START TIME: 420 PM MDT (APPROX)  
START LOCATION: 12 MILES SOUTH-SOUTHWEST OF DOUGLAS, WY  
START LAT/LON: 42.5681/-105.4325  
 
END DATE: JULY 28 2018  
END TIME: 428 PM MDT (APPROX)  
END LOCATION: 14 MILES SOUTH OF DOUGLAS, WY  
END_LAT/LON: 42.5498/-105.4078  
 
THE SECOND TORNADO FORMED AS THE FIRST TORNADO WAS LIFTING TO THE  
WEST, TOUCHING DOWN NEAR THE WEST FORK OF LA BONTE CREEK AND  
ESTERBROOK ROAD. THE TORNADO QUICKLY STRENGTHENED TO EF-1 STRENGTH  
AS IT MOVED ALONG LA BONTE CREEK PASSING NEAR A RANCH HOUSE OFF  
ESTERBROOK ROAD. MOST OF THE DAMAGE WAS TO TREES THAT WERE SNAPPED  
MID TRUNK IN A 150 YARD PATH. THE TORNADO LIFTED AS IT MOVES EAST  
OF THE LA BONTE CREEK AREA. THE GROUND SURVEY TEAM LOST TRACK OF  
THE TORNADO AS IT MOVED SOUTHEAST OF OPEN COUNTRY, SO IT IS POSSIBLE  
THE TRACK EXTENDED FARTHER THAN THE SURVEY RESULTS INDICATE. NWS  
CHEYENNE ALSO CONTINUES TO INVESTIGATE REPORTS OF DAMAGE AT  
ESTERBROOK CAMPGROUND TO THE SOUTHEAST, TO SEE IF THIS DAMAGE IS ALSO  
ASSOCIATED WITH THE SAME TORNADO REPORTED HERE. START/END AND  
LOCATIONS/TIMES OF THIS TORNADO ARE ESTIMATED FROM EYEWITNESS  
ACCOUNTS AND RADAR DATA.  
 
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.  
 

 
 
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