A new cyclone bomb is approaching the United States

Flood, snow, avalanche and fire warnings have been issued from Idaho to Colorado as areas of the United States hit by blizzards and floods in March are actively preparing for another “bomb cyclone” that combines several weather events at once.

Фото: Depositphotos

Often, floods, snow and fire coexist in the Rocky Mountains due to the diversity of the climate pattern: there can be powerful mountain storms at the same time as melting snow, rains and strong winds that sweep over dry meadows and forest belts where there is not a single green leaf, writes Time.

It was these conditions that sparked the wildfire that broke out on April 7 on the northeastern Cheyenne Indian Reservation in Montana. The house caught fire and the fire quickly spread to 1700 acres (688 hectares) of dry grass and trees. Because of this, the city of Lame Deer, with a population of about 2 thousand people, where the seat of the tribal government is located, had to be evacuated.

Fire warnings are natural for this time of year. On Monday, April 8, such warnings were issued for eastern Colorado after a fire in the vicinity of Colorado Springs the day before resulted in a temporary evacuation of two dozen apartment buildings.

According to Jennifer Stark, a meteorologist from Pueblo, Colorado, weather forecasters in March and April often issue high-level warnings on the eastern and southeastern plains of Colorado. At this time, the reactive air flow moves south and brings with it aggressive weather phenomena and strong wind.

“This is the time of year when the weather feels like a roller coaster,” Colorado State Climatologist Russ Schumacher said April 8. “Going from temperatures of 80 degrees (almost 27 Celsius) to a snowstorm in just one day is not unusual.”

Unusually what will happen next. It is predicted that the storm system, which is now approaching the Pacific Ocean, will intensify and turn into a new “bombing cyclone”.

A “bomb cyclone” is a rapid drop in atmospheric pressure (minimum 24 millibars in 24 hours). Such a cyclone often forms over or near oceans and seas: it requires warm, moist air, which mixes with cold and dry air under unstable conditions within the flow of air masses.

According to Greg Carbin, Head of Forecasting at the National Weather Service in Maryland, the central and mountainous part of the country may encounter such a cyclone. And this storm will be the second such phenomenon in less than a month. Recall that the 13 March storm caused severe flooding in the Midwest, a blizzard in Colorado and Wyoming, as well as strong winds from 96 to 110 miles per hour (155 and 177,02 km / h).

According to meteorologists, the new “bomb cyclone” will be similar in intensity and snowfall. Heavy, wet snow will develop over Nebraska and move through southern, central and southeastern South Dakota into western Minnesota. In Kansas, wind speeds can reach 50–60 mph (80–96 km/h).

“This snowstorm will worsen flooding in Nebraska by adding heavy snowfall followed by melting,” said Ryan Maue, meteorologist for Weathermodels.com. “This is bad news for farmers who can’t seem to turn the calendar to spring.”

The storm is expected to cover Idaho and western Montana and shed snow to the mountains of Montana and Wyoming to 2 feet (61 cm). In areas of Colorado, where fire warnings were issued on Monday, snow may fall by Wednesday and temperatures will fall by more than 40 degrees (by 4 Celsius).

Last weekend, rain began in many parts of Oregon, which led to flooding and the subsequent closure of schools in the central Willamette valley, and also provoked the passage of water through dams.

According to Schumacher, two “bomb cyclones” are still not an entirely common occurrence, but the cause of climate change is difficult to pinpoint. "I'm not sure we have the answer," the meteorologist says.

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