From record-breaking heat to freezing cold: blizzard hits several US states

Residents of Denver, Colorado went from record heat to a sudden snow storm. Temperatures in the city are expected to plummet, from a low of 101 degrees Fahrenheit (38,3 Celsius) on Saturday, September 5, to a predicted 32 degrees (0 Celsius) on Tuesday, September 8. Sunday was also hot - 97 degrees (36 Celsius), writes CNN... It is already snowing in other states.

Photo: Shutterstock

Some parts of western South Dakota received 7 inches (8 cm) of snow over the night from Monday to Tuesday (September 15 and 38), with heavy snowfall expected to continue throughout Tuesday afternoon.

On Tuesday, September 8, approximately 6 million people in the northern and central Rockies, including Denver, were under a winter weather warning. Across the region, 9-4 inches (8-10 cm) of snow could fall through Wednesday, September 20, with some spots seeing 12-18 inches (30-45 cm) at the highest elevations. As daylight arrived, snow was already falling in parts of Idaho, Utah, Wyoming and moving into northern Colorado. Snow is expected to cover Colorado by mid-morning Tuesday and continue through Wednesday morning, he said. NBC.

Photo: twitter.com/NWSBoulder

At the same time, literally over the weekend, temperatures in Colorado continued to rise, and together with arid conditions and gusty winds, this has led to the need to issue fire warnings, force evacuations in some areas and block the main road through Rocky Mountain National Park. By Tuesday morning it got much colder and light snow began to fall. Thus, in three days, Denver went from a record heat wave to one of the earliest snowfalls in history.

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Here is a loop of model forecast reflectivity through noon tomorrow. The heaviest snow is expected late this afternoon and evening. #COwx pic.twitter.com/Wf3sCFcMLP

- NWS Boulder (@NWSBoulder) September 8, 2020

Since 1950, there have been only 14 occasions when a major climate station recorded extreme heat one calendar day and snowfall the next day.

But Colorado residents shouldn't put their T-shirts in the closet just yet. It is predicted that by Friday, September 11, the city will be around 70 degrees (21 Celsius).

“Chasing” today's Denver snow event from my living room. Stay tuned for more exciting video like this. Light rain and 34 ° but check out the INTENSE stream coming out of the gutter. #COwx pic.twitter.com/XsIKB7NpV8

- Rob Bradley (@WxRobBradley) September 8, 2020

The widespread record cold (and associated snow) is caused by an abnormally strong influx of cold air from Canada. The halt of the cold front over the United States is associated with typhoon Maysak in the Pacific Ocean, which raged in early September. When autumn begins on the calendar, typhoons in the Pacific Ocean often intensify the downstream jet stream, thereby affecting the weather in North America.

Is it normal to have snow in September?

Many Denver residents take out their jackets, cover their garden plants and try to remember when they last did it in September. 9news.com.

Since then, much time has passed.

The average date for the first snowfall in Denver is October 18th. Over the past 10 years, the earliest snowfall occurred in 2012, on October 5th. The average date of first frost is October 7.

Historically, September snow is not uncommon in Denver. According to the National Weather Service, the city receives an average of about 1 inch (2,5 cm) of snow in September, although this has not happened this century.

Photo: twitter.com/NWSBoulder

Snow tracks were recorded in September 2014. The last measurable snow was 0,2 inches (0,5 cm) on September 24, 2000.

In the 1990s, Denver received more snow than the 5-year average: 5,4 inches (13,7 cm) in 1993, 1,4 inches (3,5 cm) in 1994, 7,4 inches (18,8 , 1995 cm) in 4,7, 12 inches (1996 cm) in 3,1, 7,8 inches (1999 cm) in XNUMX.

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Denver's 10 largest snowfalls in September:

• 1971: 17,2 inches (43,6 cm)
• 1936: 16,5 inches (42 cm)
• 1959: 12,9 inches (32,7 cm)
• 1895: 11,4 inches (28,9 cm)
• 1985: 8,7 inches (22 cm)
• 1995: 7,4 inches (18,8 cm)
• 1908: 6,5 inches (16,5 cm)
• 1961: 5,8 inches (14,7 cm)
• 1965: 5,5 inches (14 cm)
• 1993: 5,4 inches (13,7 cm).

September 3, 1961 marks the earliest blizzard in Denver history. The city received 4,2 inches (10,6 cm) of snow that day, and nearly a foot fell in the western suburbs and foothills.

Denver's earliest frost date was Sept. 8, 1962, when temperatures dropped to 33 degrees (0,5 Celsius), according to the NWS.

Denver is predicted not to break this record on Tuesday, September 8, but may well come close.

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