Usa Today

Wildfires in West could be exacerbated by ‘fire clouds,’ dry lightning

Orignally published on 2021-07-19 14:19:28 by rssfeeds.usatoday.com

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  • More than 80 current wildfires were burning through 1,157,976 acres in 13 states.
  • 20,000 firefighters are battling the blazes.
  • ‘Fire clouds’ and dry lightning add to misery.

Powerful storms forecast for parts of the drought-stricken West this week could actually do more harm than good as “fire clouds” and dry lightning sweep across a region already dotted with wildfires fueled by parched vegetation, heat and winds.

The storms brought flash flooding to Phoenix and other areas of the Southwest, but less rain is forecast farther north.

“These storms can cause cloud-to-ground lightning and ignite fires,” AccuWeather Meteorologist Thomas Geiger warned.

More than 80 current wildfires were burning through 1,157,976 acres in 13 states, battled by almost 20,000 firefighters. Generally unstable weather conditions could add to the misery in coming days, the National Interagency Fire Center warned. 

In North-Central California, the Dixie Fire had burned through 30 square miles and was threatening more than 800 homes and other structures. The remoteness of the fire, along with the steep terrain, was adding to issues faced by hundreds of firefighters at the scene.

“Thunderstorms with abundant lightning & little rainfall could produce new fire starts,” the National Weather Service in Sacramento warned. 

The fire’s edge is just a few miles from the town of Paradise, which burned almost completely to the ground in a wildfire three years ago. But the fire was moving away from the town, and no evacuations or evacuation warnings had been issued Monday morning.

Wildfire explodes near Lake Tahoe: Hundreds flee

Large, “pyrocumulous clouds” formed over the fire, producing a massive smoke column that further increased fire activity, CalFire said in an its latest incident report. Pyrocumulus clouds – fire clouds – look like giant, dirty-colored thunderheads that sit atop a massive column of smoke coming up from a wildfire. Often the top of the smoke column flattens out to take the shape of an anvil.

In Oregon, the Bootleg Fire has also producted pryocumulous clouds. That fire has already burned almost 500 square miles, among the largest blazes in Oregon history. Fire authorities say pyrocumulous clouds are forming from 3 p.m. to 5 p.m. each day as the sun penetrates the smoke layer and heats the ground below, creating an updraft of hot air. 

The fire, which ignited two weeks ago, remains “very active” and growing because of hot, dry, and breezy conditions, fire officials said in a bleak update late Saturday night.

“Poor humidity recovery at night is contributing to active fire spread,” fire managers said. “Robust spread rates are being generated by drought-affected fuels. Expecting similar conditions for the next several days.”

Along the California-Nevada border, the Tamarack Fire had also burned about 30 square miles. The blaze had destroyed a couple structures and was threatening the tiny California hamlet of Markleeville, population less than 150.

Dena Brown posted on Twitter that her father had been evacuated.

“We just had a 6.0 earthquake recently now this. #prayerrequest #TamarackFire,” she wrote.

Orignally published on 2021-07-19 14:19:28 by rssfeeds.usatoday.com

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