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Oregon wildfire forms ‘fire clouds’ that pose danger below – Portland, Oregon

Portland, Oregon 2021-07-16 17:05:50 –

Portland, Oregon (AP) — Smoke and heat from a large wildfire in southeastern Oregon create a huge “cloud of fire” above the flames. It can be seen from more than 100 miles (160 kilometers) away.

Authorities have placed these clouds at the top of the list of extreme fire behaviors seen in Bootleg Fire, the largest wildfire in the United States. Inferno, on Friday, New York City was raging parts of the western United States enduring a historic drought.

The fire was so dangerous from late Thursday to Friday that authorities pulled out the crew. This week’s meteorologists have also discovered something that can create larger, more extreme forms of fire clouds, or unique weather, including a “tornado of fire.”

Extreme fire behavior, including the formation of more fire clouds, was expected to persist on Friday and worsen on weekends.

What is a “cloud of fire”?

Flammagenitus clouds (literally translated as “fire clouds”) look like giant, dirty-colored thunderclouds on huge pillars of smoke from wildfires. Often, the top of the smoke column is flattened into an anvil shape.

Clouds form between 3 pm and 5 pm daily as the sun penetrates a layer of smoke to warm the ground below and create an updraft of hot air, according to Oregon fire authorities. In this fire, the crew sees the largest and most dangerous clouds on a section of the wilderness, mostly composed of dead trees. And it burns instantly and with a lot of heat.

According to officials, Bootleg Fire has risen nearly 6 miles (10 km) into the atmosphere for four consecutive days, “easily visible from 100 to 120 miles away” (160 to 193 km) in multiple fire clouds. Generated. ..

Cloud-building conditions were expected to worsen over the weekend.

What is the science behind these clouds?

When the air above the fire overheats, it rises in a large pillar. When the moist air rises, the smoke column is released into the atmosphere and the water condenses into droplets. That is what creates the “cloud of fire” that looks like a thunderstorm seen before a big thunderstorm.

But these clouds hold more than just water. Ash and particles from the fire are also swept away by them, giving them a dark gray ominous appearance.

Is there anything even more dangerous than the “cloud of fire”?

Okay. Once a flammagenitus cloud is formed over the fire, meteorologists begin to closely monitor its brother, the flammagenitus cloud.

NASA calls the latter a “fire-breathing cloud dragon.” Because they are so hot and big that they create their own weather.

In the worst-case scenario, a ground fire brigade could see one of the monster clouds spawn a “tornado of fire”, creating its own dry thunderstorm and creating dangerous hot air below. Particulate matter can also be sent up to 10 miles (16 km) above the surface of the Earth from the smoke column.

So far, most of the Bootleg Fire clouds have been less strong fire clouds, but on Wednesday the National Meteorological Service discovered the Pyrocumronimbus cloud formed on so-called “horrible” satellite imagery. ..

“Send positive thoughts and wishes to the firefighters …. It’s a tough time for them,” the Meteorological Department said in a tweet.

How dangerous are these clouds?

Both types of fire clouds pose a serious risk to firefighters.

Multiple flammagenitus clouds were discovered for four consecutive days, one on the south side of the fire partially collapsed on Thursday, causing dangerous winds and embers to fall on the crew.

As a result, all firefighters and soil-moving equipment were evacuated from that part of the fire department. Authorities say no injuries have been reported.

“We expect the exact same situation to occur today and worsen over the weekend,” Fire spokeswoman Holly Crake said on Friday.

Where else were these clouds formed?

Clouds caused by these types of fires are becoming more common as climate change prolongs and intensifies wildfire seasons elsewhere, including in the western United States and Australia.

A wildfire in British Columbia last month leveled the entire town and created a Pyrocumronimbus cloud.

California flames in 2020 and a few years earlier created multiple flood clouds, and a creek fire in the Fresno region created powerful flood clouds last fall.

Australia’s Bush fire siege in January 2020 also created a Pyrocumronimbus cloud that could cause a fire tornado.

Oregon wildfire forms ‘fire clouds’ that pose danger below Source link Oregon wildfire forms ‘fire clouds’ that pose danger below

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