(CNN)Hundreds of California residents are under evacuation orders after new fires were sparked Wednesday, with another heat wave expected to make fighting the flames even more challenging.
California is already battling the massive Dixie Fire, the state's second-largest fire and 14th most destructive on record, which has now grown to more than 747,00 acres and remains 45% contained. The blaze is threatening more than 11,800 structures and has prompted evacuation orders and warnings in Plumas, Lassen, Butte, Tehama, and Shasta counties.
"Fires burning in Northern California are exhibiting extreme fire growth based on critical fuel conditions," Cal Fire said in an incident update on Thursday. "Under these drought conditions, wildfires are burning rapidly with extreme severity and have traveled up to 8 miles in a single day. Fuel conditions are much worse than previous years and along with wind is causing much greater fire spread. Firefighters are experiencing conditions never seen before, such as increased spread rates, spotting and active nighttime burning."
Another wildfire burning in Northern California's Trinity National Forest is the Monument Fire, which has burned 157,287 acres and is 20% contained.
Meanwhile, the Caldor Fire has scorched 136,643 acres since it began August 14 and was 12% contained Thursday morning, according to Cal Fire. The fire, burning in El Dorado and Amador Counties, is the state's number one priority, officials say.
"We get the first opportunity for additional resources that become available," Cal Fire Incident Commander Dusty Martin said in a briefing Wednesday night. "We have been very fortunate in the past couple of days where we've seen a huge influx of resources into the Caldor Fire and as our operations talked about, we're starting to see the fruits of those labors."
"We're starting to gain ground on this fire and it's making a difference," he added.
Fire officials said fuel conditions and steep, rugged terrain continue to pose challenges for firefighters.
Crews battled 34 new blazes Wednesday
Firefighters battled 34 new blazes in the state Wednesday, Cal Fire said, attributing two new large fires to drought conditions.
As of Thursday morning, 33,323 people in California were under evacuation orders due to the wildfires, according to the office of emergency services.
The Airola Fire was sparked in Calaveras County and prompted officials to issue evacuation warnings and orders, according to the county's sheriff's office. The fire has scorched about 700 acres and is 10% contained.
In San Bernardino County, the South Fire scorched 700 acres and destroyed 18 structures, including numerous homes, after it started Wednesday and was 0% contained, Cal Fire said on Thursday. The fire is burning near Lytle Creek, a small community in the San Gabriel Mountains.
"We've lived here over 30 years and this is the fastest I've ever seen a fire progress," a resident told CNN affiliate KABC. "We got home and there was no time to evacuate, no time to get anything so it's just whatever we're wearing, this is it."
"We know several of our neighbors' homes has burned, we're still not sure what the status is of our house," the resident added.
Parts of the county were put under evacuation orders and warnings while other residents were advised to shelter in place, the San Bernardino County Sheriff's Department said Wednesday in a Facebook post. The evacuation orders are in effect for 1,000 people, officials said.
Laura Mills told CNN affiliate KCBS she lives in in the area where the fire is currently burning.
"I came home and got the dogs," she told the news outlet. "Hopefully our house is going to make it."
Meanwhile, the Bennett Fire began Wednesday in Nevada County and prompted officials to issue evacuations in some areas as well as order others to shelter in place, the county's office of emergency services said in a tweet. As the 59-acre fire was 70% contained, Cal Fire said, and some of those evacuation orders were lifted.
A devastating wildfire season
So far this year, firefighters have battled 6,773 new wildfires across the state which have burned more than 1.6 million acres, according to Cal Fire.
In the same time period last year, crews battled 7,389 fires.
According to Cal Fire, Northern California has so far experienced large fire activity and will "likely experience an extended fire season."
The California Office of Emergency Services says nearly 700 people are seeking shelter in 16 facilities throughout the state.
"Don't wait, evacuate!" is their reminder to residents to heed emergency notifications.
Temperatures are expected to be 5 to 10 degrees above normal through the weekend in California, CNN meteorologist Michael Guy said.
And while this isn't uncommon for the region during this time of year, "any type of temperature increase is not good for the firefighters or any personnel fighting the fires with their exposure to intense temperatures as it is," Guy said. He noted that the warmer weather is not expected to worsen the current fire conditions.
Study: Wildfire smoke threatens possible Covid-19 surge
The 88 large wildfires currently burning in the US have scorched 2.5 million acres, according to the National Interagency Fire Center, and their smoke has put thousands under poor air quality alerts.
Thick wildfire smoke blanketed the resort communities of Lake Tahoe this week as the Caldor Fire burning east of Sacramento, California, continued to swell.
The Air Quality Index, a measure of how unhealthy the air is, spiked to an astonishing 694 in Tahoe City on Monday, according to AirNow.gov. In Reno on Tuesday, the AQI hit 453. An AQI between 300 and 500 is considered "a health warning of emergency conditions" in which even healthy individuals are at risk for respiratory illness. AQI below 50 indicates the air is healthy and poses little to no risk, even to individuals with respiratory disease.
The index has been around or above 300 in the Tahoe and Reno areas every day since Friday.
Washoe County, which includes Reno, issued a Stage 3 Emergency air quality advisory on Monday for the first time, warning residents to stay indoors with windows and doors closed.
Compounding the problem, researchers have found recently that wildfire smoke has a significant impact on the severity of coronavirus cases. A study published this month in the journal Science Advances found increases in fine particulate matter from wildfire smoke in 2020 led to a surge in Covid-19 cases and deaths in California, Oregon and Washington.
"What's happening in Lake Tahoe and in Reno is very concerning," Francesca Dominici, a researcher at Harvard T.H. Chan School of Public Health and co-author on the wildfire smoke study, told CNN, "because we know that exposure to a high level of fine particulate matter can amplify the negative effect of the pandemic."
Covid-19 cases and hospitalizations have been climbing precipitously in the Reno area over the past several weeks, according to Washoe County health data. Coronavirus cases in Washoe County on Monday were up 24% compared to the week before, and hospitalizations increased by more than 18%.
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