Wyoming
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Laramie
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Cheyenne
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August 01, 1985
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Flood
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12
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$176,573,000.00
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$65,000,000.00
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A near-stationary thunderstorm produced record flash floods in Cheyenne and across the state. The storm killed 12 people, injured 70, and caused extensive damage to private and public property. Damage estimates ranged from $40 to $65 million. The NWS Forecast Office near the airport reported 6.06" of rain in 3 hours. In addition to the rain, there was hail up to 2" in diameter and 70 mph winds. Ten of the 12 deaths occured along Dry Creek when people attempted to cross flooded streets in their cars.
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Utah
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Davis, Salt Lake, Weber
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Centerville, Salt Lake City
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December 01, 2011
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High Wind
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$88,362,300.00
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$68,000,000.00
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A downslope windstorm along the Wasatch Front with winds of 60-80 mph. The peak gust of 102 mph recorded in Centerville. The majority of damage occured between North Salt Lake and South Ogden. Winds caused $4 million in infrastructure damage, almost entirely in Davis County, destroying hundreds of trees, powerlines, street signs and light poles. Private insured losses in Davis County alone were estimated at $64 million, mostly damage to glass, roofs, and fences. Additionally, 11 semi-trailers were knocked over on I-15. Damages resulted from wind directly and also from flying debris.
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Colorado, Wyoming
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March 13, 2021
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Winter Storm
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$80,902,700.00
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$75,000,000.00
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Winter Storm Xylia. "Cheyenne, Wyoming, was buried by 30.8 inches of snow from March 13-14. According to the National Weather Service, 22.7 inches of snow fell on March 14, alone, which smashed the city's all-time single-day snow record which was set on Nov. 20, 1979 (19.8 inches). That snowstorm total was more than half of Cheyenne's average annual snowfall (60.3 inches). The National Weather Service said snowdrifts in southeast Wyoming were 5 to 10 feet high in some areas. Denver had its fourth-heaviest snowstorm on record after it piled up 27.1 inches. It was their heaviest since the March 2003 snowstorm." - The Weather Channel
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Colorado
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Pueblo, Denver, Broomfield
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Pueblo, Denver, Broomfield
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June 02, 1921
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Flood
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78
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$1,330,010,000.00
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$81,449,000.00
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$1,096,046,204 | Over 9" of rain fell in the Pueblo area, causing extreme flash flooding on the Arkansas River. A bridge collapse in Pueblo caused many fatalities. Related rain events caused flooding and damage on the South Platte River, Coal Creek, Boulder Creek, and St. Vrain Creek.
Denver Library Image
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Colorado
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La Plata
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June 09, 2002
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Wildfire
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1
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$144,280,000.00
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$88,800,000.00
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"The Missionary Ridge Fire began on June 9, 2002, northeast of Durango in southwest Colorado. It burned until July 15, destroying forty-six houses and cabins and charring 73,000 acres of La Plata County forest. One firefighter died while fighting the blaze, which became the seventh-largest wildfire in Colorado history.
The Missionary Ridge Fire was not as destructive as some other fires in 2002, as property losses totaled just over $24 million. It did cost some $37 million to fight, and the Forest Service was estimated to have lost more than $27.8 million in assets, such as recreational areas that were damaged or destroyed." - Colorado Encyclopedia
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Colorado
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Fort Collins, Boulder
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March 17, 2003
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Winter Storm
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$147,737,000.00
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$93,000,000.00
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A very strong three-day upslope snowstorm brought huge snow amounts and blizzard conditions to most of the Front Range and the adjacent plains. Storm totals included 32" in Denver, and 87" in Rollinsville.
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Wyoming
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Campbell, Sheridan, Park, Crook, Big Horn
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Wright, Sundance
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April 25, 1984
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Winter Storm, High Wind
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2
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$281,324,000.00
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$100,000,000.00
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2' to 3' of spring snow fell along with 65 mph winds, causing 15-20' drifts. The storm occurred during spring calving and lambing season, causing the loss of more than 200,000 sheep and cattle. High winds and the weight of snow on structures caused significant economic damage.
"From April 25-27, 1984, the worst late spring blizzard ever to hit Wyoming battered the northern part of the state for three days. The northeast section was the hardest hit as snowfalls of 2 to 3 feet were whipped into 15 to 20 foot drifts by 65 mph winds. A rancher near Wright and one near Sundance died of exposure as they were stranded while hauling hay to their livestock. All of northeast Wyoming was effectively shut down for two days. Major damage occurred to the livestock industry as more than 200,000 sheep and cattle perished in the storm. Some ranchers lost up to 95 percent of their sheep, and up to 50 percent of their cattle. Contributing factors to the very high losses were: a large number of the sheep had recently been shorn; the livestock were well into the spring lambing and calving season; and finally, the storm started as cold rain that changed to wet snow which stuck to everything. In addition, the weight of the record-breaking snow damaged many roofs, and high winds of 50 to 65 mph blew down quite a few structures. Total economic loss was estimated at more than $100 million. The storm is the costliest in Wyoming’s history." - WY Hazard Mitigation Plan 2021-2026
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Colorado
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Larimer
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Fort Collins
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June 09, 2012
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Wildfire
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1
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$143,038,000.00
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$112,354,000.00
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The High Park fire was ignited by lightning after a very dry winter and spring, and burned over 87,000 acres and at least 259 homes.
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Wyoming
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Laramie
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Cheyenne
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July 11, 2011
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Hail
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$155,933,000.00
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$120,000,000.00
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The most costly hailstorm in Wyoming history. Hail up to 2" in diameter covered most of Cheyenne, with accompanying rain totalling 1.46" of precipitation. Widespread damage to buildings and cars.
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Wyoming
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Park
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July 01, 1988
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Wildfire, High Wind
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2
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$296,496,000.00
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$120,000,000.00
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In 1988, Yellowstone National Park recorded almost no rain during the summer months. During the later half of summer, several smaller fires were started by lightning. High winds and dry conditions caused the fires to rapidly spread and merge. Before a cold front helped contain the fires, 9,000 firefighters, and 100 engines were mobilized to fight the blazes. Before containment, the complex burned 793,880 acres (36% of the park) and cost $120,000,000 in supression efforts. The fire destroyed 67 buildings along with backcountry and frontcountry infrastructure. The fires had far-reaching ecological impacts which have been the subject of numerous studies.
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