Utah
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Washington
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St. George
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December 21, 2010
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Flood
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Virgin River Flood. "In 2010, a widespread, long duration rainfall event continued for 4 straight days. The North Fork Virgin River, which has a base flow rate of 100 cubic feet per second, rose to 6,000 cubic feet per second during this event. The Virgin River near the town of St. George recorded flows rising from 100 cubic feet per second to 25,000 cubic feet per second in a 24-hour period. Zion National Park was heavily damaged due to the flooding. The town of Washington also reported widespread flooding." - National Weather Service
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Utah
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Wayne
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Hanksville
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January 01, 2006
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Flood
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Escalante River Flood. "The flooding of the Escalante River in 2006 resulted in widespread destruction of most of the roads in the Grand Staircase Escalante National Monument. Hundreds of people were stranded during the flooding in many of the National Parks and Monuments. Many roads remained unrepaired for up to 5 years. The Grand Staircase Escalante National Monument was closed to visitors. The rainfall and runoff from this event caused Lake Powell to rise by 5 feet during this storm. Hanksville was also heavily damaged and irrigation systems were destroyed." - National Weather Service
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Wyoming
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Laramie
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Cheyenne
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July 15, 1896
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Flood
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Cheyenne Flood. "Heavy rain (4,78 inches in 3 hours) caused flooding resulting in extensive damage to buildings, transportation facilities, and utilities. There was loss of lives." - University of Wyoming
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Colorado
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Boulder, Broomfield, Adams, Weld, Morgan
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Boulder, Louisville, Lafayette, Broomfield, Northglenn, Brighton, Fort Morgan
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June 18, 2018
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Hail
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$2,400,000,000.00
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"On the evening of June 18th, a severe storm in northern Colorado produced baseball-sized hail and powerful winds. The storm damaged cars and homes in the Boulder area, before moving northeast toward Fort Morgan, where 70 mph winds and baseball-sized hail wreaked havoc in Morgan County. Storm reports included heavy rain in many parts of Colorado, with funnel clouds and tornadoes in the Eastern Plains." - NOAA NCEI
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Colorado
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Kit Carson
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Bethune
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August 13, 2019
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Hail
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Record size hail for Colorado.
"Severe thunderstorms formed across eastern Colorado the afternoon of August 13, 2019. Several grew in strength and became supercells and by 2 PM several supercells began to interact with one another in northwestern Kit Carson County. At around 3 PM, the strongest of the storms generated hail to about 5" in diameter that fell on a farm northwest of the town of Bethune. This ended up being the largest hailstone officially analyzed and recorded in the state of Colorado. Amazingly, just two days prior and about 60 miles northwest of the record breaking hail, another supercell dropped grapefruit size hail with reports up of 5" diameter, but no hailstones were officially measured nor saved for later analysis from that event. The record breaking hailstorm occurred just outside NWS Boulder's area of responsibility, in western Kit Carson County, CO. NWS Goodland has a great write up of the hailstone, hail damage, and subsequent certification of the largest stone officially measured and validated in the state of Colorado, at 4.83" diameter. Please visit the NWS Goodland page for those details. https://www.weather.gov/gld/8132019CORecordHailstone" - National Weather Service
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Utah
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Davis, Salt Lake, Weber
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Salt Lake City, Farmington, Centerville, Ogden
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September 08, 2020
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High Wind
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1
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The wind event along the Wasatch Front was associated with the strong upper level low pressure system that brought a cold wave and snow to Colorado and Wyoming. Winds from this storm came from a northeasterly to an easterly direction. Winds from the east along the Wasatch Front cause very strong downslope winds near the base of the Wasatch Mountains. Wind gusts reach 89 mph at the University of Utah and 77 mph at the airport in Salt Lake City. The highest recorded wind speed was 99 mph in Farmington. This wind event differed from many Wasatch Front downslope wind events, because the high winds extended much further west from the mountains than is typical. Strong winds below over thousands of mature trees, damaging powerlines, structures and closing roads. Nearly 180,000 customers lost power in Utah during this storm.
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Colorado, Wyoming
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December 15, 2021
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High Wind
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A severe storm with hurricane-force gusts affected Colorado and Wyoming over the course of a few days. This storm also brought the first tornado ever reported in Minnesota during the month of December, according to NOAA data.
CO: "The National Weather Service office in Pueblo recorded a 107 mph wind gust in Lamar shortly before 9 a.m." - CBS Denver
WY: "A National Weather Service peak wind report released Sunday morning showed a 118 mph gust blasted Clark, a small community in the northern part of the state, north of Cody." - Deseret News
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Colorado, Utah, Wyoming
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June 06, 2020
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High Wind
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"A powerful upper-level disturbance moving through the Rockies and Plains on June 6, 2020 sparked the development of a line of thunderstorms that brought widespread damaging winds from Utah and Colorado through northeastern Wyoming, western South Dakota, and southwestern North Dakota. Given the scope and intensity of the damaging winds, the storm system was classified as a "derecho" by the Storm Prediction Center.
Derechos are characterized by a several hundred mile-long swath of persistent severe wind gusts (58 mph or greater), with embedded wind gusts that are considered significantly severe (75 mph or greater). There is more information about derechos here." - National Weather Service
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Colorado
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Garfield
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Glenwood Springs
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July 29, 2021
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Landslide
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"Torrential rain fell and the charred land stripped of vegetation gave way, sending a rush of mud and boulders tumbling down steep canyon walls and onto highway I-70 near Glenwood Springs. Mudslides have become more frequent and intense since the Grizzly Creek Fire scorched about 50 square miles (130 square kilometers) in the summer of 2020." - PBS News Hour
CBS Images
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Utah
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Salt Lake
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April 10, 2013
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Landslide
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"On the evening of 10 April 2013 (MDT) a massive landslide occurred at the Bingham Canyon copper mine near Salt Lake City, Utah, USA. The northeastern wall of the 970-m-deep pit collapsed in two distinct episodes that were each sudden, lasting ~90 seconds, but separated in time by ~1.5 hours. In total, ~65 million cubic meters of material was deposited, making the cumulative event likely the largest non-volcanic landslide to have occurred in North America in modern times. Fortunately, there were no fatalities or injuries." - GSA Today
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