WFO Denver/Boulder

...July 23 in Metro Denver weather history...
7-25 In 1934, a streak of 15 consecutive days of 90 degrees ranked 5th on the list of hot streaks. The record of 24 consecutive days was established in the summer of 2008. 13-5 In 2008, a streak of 24 consecutive days of 90 degrees shattered the previous record of 18 consecutive days established in 1901 and 1874. Ironically, no new single day record high temperatures were set in the month of July. In August however, a record of 104 degrees was set on the 1st, and another record of 103 degrees was set on the 2nd. In addition, a record low min of 70 degrees was set on August 2nd. 18-2 In 1987, a streak of 16 consecutive days of 90 degrees ranked 4th on the list of hot streaks. The record of 24 consecutive days was established in the summer of 2008. 19-23 In 2005, the high temperature climbed above 100 degrees on each of the 5 days with readings of 101 on the 19th, 105 on the 20th, 104 on the 21st, and 102 on both the 22nd and 23rd. A new record maximum temperature for the month of July of 105 degrees was set on the 20th, which also equaled the all time record maximum for Denver of 105 degrees first set on August 8th in 1878. Daily maximum temperature records were set on each day, and the 5 day period equaled the record for the most consecutive days of 100 degrees or more first set from July 4th through 8th in 1989. The intense heat resulted in a high use of electricity for cooling purposes. The demand for electric power exceeded the supply and rolling black-outs, each lasting about an hour, were scheduled across metro Denver during the afternoons and early evenings. 20-23 In 1961, unusually cool weather for July resulted in several temperature records. Record minimum temperatures were set or equaled on each day with readings of 51, 51, 49, and 49 degrees. High temperature of only 64 degrees on the 21st was a record low maximum for the date. 20-25 In 1965, heavy showers and thunderstorms doused metro Denver with significant rain each day. Rainfall for the six days totaled 5.16 inches at Stapleton International Airport. Massive rainfall occurred on the 20th, 21st, and 25th, flooding streets and basements and causing streams to overflow. The heaviest rainfall, 2.05 inches, at Stapleton International Airport occurred on the 25th. 22-23 In 1991, heavy rains over the Palmer Divide and along the Front Range caused the South Platte River to flood from near Henderson to Fort Lupton. The river was out of its banks at several locations with water covering the roads through the night. Only minor damage was reported. 23 In 1901, the temperature climbed to a high of 90 degrees, marking the 18th consecutive day with a high temperature of 90 degrees or more. This equaled the record of 18 consecutive days set from July 1st through July 18th in 1874. In 1910, the temperature climbed to a high of 101 degrees in downtown Denver. In 1936, the high temperature reached 100 degrees in downtown Denver. In 1957, a tornado was observed by National Weather Service personnel 25 miles east-northeast of Stapleton Airport for 7 minutes. No property damage or injuries were reported. The public reported a funnel cloud 10 miles northeast of Brighton. In 1960, lightning struck many locations across metro Denver. A Boy Scout leader was struck and injured at the Rocky Mountain Arsenal. Some sections of Arvada were blanketed with a white layer of hailstones. A number of weed fires were started by lightning. Some houses were struck, but no serious damage occurred. Heavy rain fell from northwest Denver to Brighton with up to 1.50 inches in some areas. In 1965, heavy rain flooded and damaged homes in Georgetown, where the sewer system was damaged and the water supply contaminated. Heavy rains in Aurora washed out earthen bridges over Sand Creek. Streets were flooded in Denver. Several highways were washed out to the east and southeast of Denver. In 1975, heavy rains caused flash flooding in the foothills west of Denver. Several roads and businesses were damaged in the Central City and Blackhawk areas. In 1983, heavy thunderstorms blasted Denver and areas to the south. Douglas county was hardest hit. Golf ball size hail fell in and near Parker. Many homes at the Pinery south of Parker had windows broken and paint stripped by the storm with some vehicles dented by the large stones. In Parker, 1.90 inches of rain fell in just 30 minutes. Many roads in Douglas County were washed out, and at least one bridge was damaged. Up to 2 inches of rain fell in Lakewood, and Littleton was drenched by 1.60 inches in 15 minutes. A department store in Lakewood suffered water damage when a pipe handling runoff broke, sending 4 inches of water onto the floor of the store. In 1990, a thunderstorm wind gust to 53 mph was recorded at Stapleton International Airport, where 1/8 inch diameter hail fell. In 1992, heavy thunderstorm rains caused Howard Gulch in southeast Denver to flow over its banks. A weather spotter recorded thunderstorm wind gusts to 63 mph in Aurora. Another spotter measured a wind gust to 60 mph, which toppled a large tree. Thunderstorm winds gusted to only 41 mph at Stapleton International Airport. In 1996, hail, as large as an inch in diameter, fell 5 miles west of Castle Rock. In 1997, damaging thunderstorm winds associated with a wet microburst ripped the roof off a barn near Brighton, causing the east side of the structure to collapse. The roof of a nearby utility shed was also lifted off and blown 60 feet away. West winds gusted to 38 mph at Denver International Airport. In 2001, a severe thunderstorm pelted Littleton with hail as large as 1 1/2 inches. Total damage to vehicles, roofs, buildings, and landscaping totaled over 600 thousand dollars. Rain leaked into offices, damaging computers. Almost every vehicle parked in the Littleton Center lot sustained some hail damage. Thunderstorm winds gusted to 55 mph at Denver International Airport. In 2002, a small tornado briefly touched down near Bennett. No damage was reported. In 2004, heavy thunderstorm rainfall in the Overland fire burn area caused flash flooding in Jamestown. Up to a foot of water reportedly covered the highway near Jamestown. Many of the town's culverts filled with dirt and debris, causing the overflow to wash onto streets and into homes. Heavy machinery had to be used to remove piles of mud up to 7 feet deep. Parked cars slid down the street with the mud and water, and many had to be dug out. The fire station in Jamestown was inundated with 10 inches of muddy water. Heavy thunderstorm rainfall caused street flooding in Federal Heights and Thornton. Several streets were inundated with 2 to 4 feet of water, including 84th Avenue and Grant Street, Conifer Street and Huron Blvd., 102nd Ave. and Melody, as well as 83rd Ave. and Washington. Several cars were stranded in the flood waters. Heavy rainfall also caused street flooding in parts of Westminster. Water reportedly flowed into car windows just north of 104th Avenue and U.S. Highway 36. Sections of two roads had to be closed due to flooding. Heavy thunderstorm rainfall of up to 2 inches in 45 minutes caused flash flooding just east of Aurora. Floodwaters ranging from 2 to 3 feet deep forced the closure of Powhaten, Gun Club and Picadilly Roads. Lightning caused power outages in parts of Arvada. About 9800 customers were without power for up to 90 minutes.

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