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Heat wave settles in over U.S. West, raising wildfire risk

Tens of millions of Americans living in the U.S. West endured scorching temperatures on Tuesday while wind gusts and dry conditions stoked dozens of wildfires, prompting evacuations across the parched region.

Excessive heat will blanket an area stretching from the U.S. Southwest north through Nevada and into Idaho and Montana over the next two days before milder temperatures arrive on Friday, the National Weather Service said. More than 20 million people are affected by the service's advisories.

Temperatures in Phoenix and Las Vegas were expected to surpass 110 degrees Fahrenheit (43 C) by midday on Tuesday while 1,200 miles (1,900 km) to the north in Billings, Montana, a high of 107 degrees Fahrenheit was forecast by the service.

The heat, along with persistent windy and dry conditions, has amplified the threat of wildfires over the last few days.

About 20 fires were burning throughout the state, scorching more than 100,000 acres (40,470 hectares) so far, said the California Department of Forestry and Fire Protection. Three of the fires were 98% contained as of Tuesday morning.

In Riverside, California, about 55 miles (88 km) east of Los Angeles, a blaze that began on Sunday destroyed or damaged more than a dozen homes over the past two days. The Hawarden Fire, which was 20% contained as of Tuesday, was sparked by fireworks, authorities said, forcing about 100 people to evacuate, injuring two residents and burning more than 500 acres, officials said.

The California blazes were among some 69 large, active fires burning in the West, including 24 in Oregon and 9 in Arizona, according to the National Interagency Fire Center.

The center urged residents in the region to stay vigilant and prepare to evacuate at a moment's notice.

The Biden administration said on Tuesday that the U.S. National Oceanic and Atmospheric Administration (NOAA) would begin sharing satellite data with the interior and agriculture departments in an effort to rapidly detect and report wildfire starts.

"With more real-time information we can reduce the risks to crews ... and improve our response time reducing the risk to impacted communities," Secretary of Agriculture Tom Vilsack said in a statement.

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Trending Video

Sclerotinia and Lygus in Seed Canola: Field Update with George Lubberts, CCA | Enchant, Alberta

Video: Sclerotinia and Lygus in Seed Canola: Field Update with George Lubberts, CCA | Enchant, Alberta

Join Certified Crop Advisor George Lubberts for this Prairie Certified Crop Advisor (Prairie CCA) field update from Enchant, Alberta. In this 12th video of the series, George takes us into a seed canola field where the male rows have been removed and the female plants are filling pods. This video was taken in the third week of August 2025.

George discusses the early signs of sclerotinia stem rot, explaining how infection begins in the stem, impacts pod development, and leads to premature ripening. He also shares insights on lygus bug management, including timing of spray applications to minimize feeding damage and maintain seed size and quality.

With cool, damp summer conditions, George notes that while disease pressure is present, overall field health remains good. The crop is just beginning to show early seed colour change, signaling progress toward maturity.

Topics Covered:

•Sclerotinia stem rot identification and impact

•Managing lygus bugs in seed canola

•Crop stage and seed colour change observations

•Timing insecticide sprays for optimal protection

•Insights from a CCA field perspective in southern Alberta