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Western US pattern change to bring wildfire and smoke relief for some, high fire danger for others

By Renee Duff, AccuWeather senior meteorologist

Published Sep 14, 2020 7:58 AM EDT

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Wildfires have raged across the West Coast from California to Washington, leaving behind the scorched remains of vehicles, homes and businesses on Sept. 13.

As the death toll from the wildfires that have charred millions of acres and created apocalyptic scenes across the West continues to climb, forecasters say that a pattern change is imminent -- but it might not be good news for all.

Over 4.7 million acres of land have been charred by active fires burning across the West, with most of these blazes ongoing in California, Washington and Oregon, according to the National Interagency Fire Center. Many of these blazes exploded in size during a high wind event around the Labor Day holiday.

At least 35 people have been killed along the West coast as a result of the blazes, and tens of thousands have been forced to evacuate, according to The Associated Press.

George Coble walks through what remains of a home on his property destroyed by a wildfire Saturday, Sept. 12, 2020, in Mill City, Oregon. (AP Photo/John Locher)

The amount of smoke being emitted by the blazes has led to extremely unhealthy air quality from Seattle to San Francisco and points inland. High temperatures were about 10-15 degrees Fahrenheit below normal in this corridor over the weekend as the thick smoke obscured the sun.

Some of the smoke has billowed high into the atmosphere has been visible as a hazy sky overhead in the Midwest and parts of the Northeast.

Experts say that Mother Nature will provide some hope for northern areas of the West this week, but not so much for southern areas.

"Across the Pacific Northwest, there is some hope for rain this week. This rain is hopefully a sign of things to come as we head toward the climatological end of the fire season across much of the Northwest," AccuWeather Senior Meteorologist and western U.S. blogger Brian Thompson said.

The first bout of wet weather arrived late Monday, bringing Seattle its first rainfall since Aug. 31. Spotty showers will linger along the immediate coast on Wednesday as a storm system swirls just offshore. While significant rainfall is not anticipated, the increased humidity levels will limit the threat of new blazes igniting and should help fire crews gain the upper hand on active fires.

Winds from the Pacific Ocean will also help to disperse smoke away from the coast, but this could lead to worsening air quality farther inland across the Northwest into midweek.

Even if the smoke disperses for a time during the day, at night when a temperature inversion sets up, smoke can once again become trapped near the ground. A temperature inversion means that the air is warming up with altitude, as opposed to cooling down.

This satellite image from late Sunday, Sept. 13, 2020, shows an extensive amount of smoke over the West. The clouds offshore are indicative of a stormy system that will offer some relief to the Northwest into midweek. (CIRA at Colorado State / GOES-West)

CIRA at Colorado State / GOES-West

To the south of the storm system, AccuWeather meteorologists are concerned that gusty winds may increase with no rainfall across Northern California and into the Great Basin, leading to an increased fire danger. Even farther south where winds may not be as gusty, some of the larger fires can create their own locally strong winds due to the amount of heat generated by these infernos.

The storm system is forecast to slowly move onshore late in the week, bringing more widespread showers with it, possibly as far south as Northern California.

Up to 0.50 of an inch of rain will be possible across the Pacific Northwest late in the week, with most of the rain expected along the immediate coast.

"Spotty thunderstorms cannot be ruled out with this system, so you may have a situation where lightning may spark new fires - something we'll have to keep a close eye on," Thompson said, adding that he was confident that the positives would outweigh the negatives with this storm in the Northwest.

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However, it may be a different story farther south and west.

"The bad news with this storm is that it will promote gusty winds right as it moves ashore on Thursday across the interior Pacific Northwest, with gusts up to 30 mph, which could help fuel the fires in the area prior to any beneficial rain," AccuWeather Meteorologist Tyler Roys said.

Gusty winds will also significantly increase the fire danger over the Great Basin and central Rockies late in the week, with no rainfall expected from the storm in these areas. Smoke is likely to be more widely dispersed out of California during this time frame.

Related:

How inhaling wildfire smoke can wreak havoc on your health
How wildfires leave communities vulnerable to flooding, mudslides for years
Heroic woman recounts near-death experience in California inferno
California wildfire tears through camp for children with cancer

"In areas where there is smoke, daily afternoon temperatures will continue to be suppressed," Roys said.

Smoke inhalation can make breathing difficult and can cause coughing, runny nose, bronchitis, wheezing and exacerbation of chronic diseases such as asthma and chronic obstructive pulmonary disease (COPD), according to Plume Labs, a company that monitors air pollution around the globe.

Officials are warning people to avoid or limit spending time outdoors amid the hazardous smoky conditions.

There is a chance the 2020 fire season across the West may approach the record number of acres burned in modern history, 10.1 million in 2015.

Residents across the western U.S. can monitor the air quality levels in their neighborhood with AccuWeather’s Air Quality page, which includes detailed air quality forecasts.

Visit accuweather.com/airquality

Keep checking back on AccuWeather.com and stay tuned to the AccuWeather Network on DirecTV, Frontier and Verizon Fios.

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