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Emergency personnel working around the clock to contain the Tamarack Fire near the town of Markleeville on July 17. Photo: Ty O'Neil/SOPA Images/LightRocket via Getty Images

A massive, uncontained wildfire has crossed the border from Northern California into Nevada — triggering fresh evacuations, this time in the Silver State, AP reported early Thursday.

The big picture: The Tamarack Fire, south of Lake Tahoe, has razed over 68 square miles since erupting on July 4 — one of 23 blazes ignited by lightning strikes, according to the U.S. Forest Service. It's one of 78 large fires raging across 13 U.S. states.

Of note: Oregon's Bootleg Fire, the largest blaze in the U.S. and which officials say was also sparked by lightning, swelled to 618 square miles in the Fremont-Winema National Forest.

Yes, but: Cooler conditions with less gusty winds were assisting Oregon firefighting efforts on Wednesday and the blaze was 38% contained, per the U.S. Forest Service.

  • "The fire also was approaching an area burned by a previous fire on its active southeastern flank, raising hopes that lack of fuel could reduce its spread," AP noted.

Context: The wildfires, many of which started when a severe heat wave erupted in June, have been linked by scientists to human-caused climate change.

Go deeper: Western wildfire smoke chokes Upper Midwest, East Coast

Go deeper

Heat dome sends temperatures soaring from Oregon to Louisiana

Forecast maximum temperatures (darker red shading represents the hottest temperatures, in the upper 90s to low 100s, Fahrenheit). July 29. Image: WeatherBell

The Pacific Northwest is once again in the midst of a heat wave after already seeing its worst such event on record this summer. Temperatures are soaring into the low 100s in some areas, while dangerous heat is also affecting the South Central states and Gulf Coast.

Why it matters: The occurrence of yet another heat wave during a drought in the West is ratcheting up wildfire risks. The heat itself is a major public health risk, as extreme heat is typically the biggest annual weather-related cause of mortality in the U.S.

Updated 6 hours ago - Sports

Olympics dashboard

Katie Ledecky in Tokyo. Photo: Ding Xu/Xinhua via Getty Images

🚨: Simone Biles won't compete in individual vault or uneven bars

🏊‍♀️: Katie Ledecky wins gold in women's 800m freestyle

🏊: Caeleb Dressel breaks world record in men's 100m butterfly, 3rd gold

🇬🇧: Britain wins gold in first-ever Olympic mixed 4x100m medley relay

🎾: Novak Djokovic defeated in Olympic semi-finals

💻: Japan tests teleporting games and "remote cheering"

Go deeper: Full Axios coverage

Updated 7 hours ago - Sports

Simone Biles won't compete in individual vault or uneven bars Olympic finals

Photo: Loic Venance/AFP via Getty Images

Simone Biles will not compete in the individual vault or uneven bars finals at the Tokyo Olympics, USA Gymnastics announced Friday.

Why it matters: USA Gymnastics said Biles, who previously withdrew from the individual all-around and team finals to prioritize her mental health, will continue to be evaluated to determine if she'll compete in the balance beam or floor exercise events.