California wildfires have burned more than 2 million acres and prompted widespread power outages

As of Tuesday morning, park visitors waiting to be rescued were not in immediate danger, but they would eventually be at risk if the fire grows, Hall told "Today."

The Creek Fire has forced evacuations in Madera and Fresno counties. The fire is an "unprecedented disaster" for Fresno County, US Forest Service Supervisor Dean Gould said Monday, adding that while major wildfires have occurred in the area before, this fire is the "most aggressive of any of those."

The wildfire has caused heavy structural damage, and current conditions prevented damage inspection teams from getting into the areas to survey exactly how many structures have been lost, a Cal Fire official said during the briefing.

California wildfires have burned more than 2 million acres this year

At least 22 large fires are burning in California, where dry, windy conditions and record-breaking high temperatures have been fueling flames for weeks in some areas.

Another is the El Dorado Fire in Southern California's San Bernardino County, which officials say was sparked Saturday morning by a pyrotechnic device used during a gender reveal party. That blaze has scorched 10,574 acres and was 16% contained as of Tuesday morning, officials said.

Three groups of fires largely triggered by lightning last month in Northern California -- the SCU, CZU and LNU lightning complex fires -- are mostly contained after collectively burning more than 858,000 acres.

Weather conditions will mean high fire risks from Washington to Arizona -- including much of California -- Tuesday and Wednesday. As of Tuesday morning, areas covering more than 38 million people in six Western states were under red flag warnings, which caution that conditions likely to start or spread fires -- strong winds and dry conditions -- were imminent or happening.

Wind gusts of 30 to 55 mph are possible in parts of California on Wednesday, CNN meteorologists said.

"Wind like this will fuel (fires) and move them along. If you get evacuation notices today, you need to pay attention to them. These fires will be moving very, very quickly," CNN Meteorologist Chad Myers said.

More than 75 large wildfires are burning across the United States, according to the National Interagency Fire Center, and California has been the hardest hit state. More than 4.6 million acres have been burned nationwide so far this year, according to the NIFC. More than 2.09 million of those acres have burned in California, Cal Fire has said.

A utility has intentionally shut power to some customers because of fire risk

While firefighters battle flames and rescue people from dangerous areas, a utility is temporarily shutting electricity service for tens of thousands of customers.

Pacific Gas and Electric (PG&E) is intentionally cutting power in 22 Northern California and Central Valley counties to lessen the chance that any electric equipment damaged by winds would cause more fire. About 172,000 PG&E customers were expected to be impacted by Tuesday afternoon, with full restoration expected by Wednesday evening.

Fire threat closes national forests

Another safety measure due to the "monumental fire threat" is the closure of national forests in Southern and Central California. Statewide, all campgrounds will be closed for day use and overnight camping starting Monday night, the US Forest Service said.

"Most of California remains under the threat of unprecedented and dangerous fire conditions with a combination of extreme heat, significant wind events, dry conditions, and firefighting resources that are stretched to the limit," the release said.

Full closures impact Stanislaus, Sierra, Inyo, Los Padres, Angeles, San Bernardino and Cleveland national forests. Sequoia National Forest will be closed as well, but the National Park remains open with no fires allowed and a warning of poor air quality.

Closures mean no hiking, biking, fishing or even taking scenic drives. The Forest Service hopes closures will reduce the potential for fires caused by humans. They will be re-evaluated daily as conditions change.

"The wildfire situation throughout California is dangerous and must be taken seriously. Existing fires are displaying extreme fire behavior, new fire starts are likely, weather conditions are worsening, and we simply do not have enough resources to fully fight and contain every fire," said Randy Moore, regional forester for the USDA Forest Service Pacific Southwest Region.

Despite how large and widespread the fires in the US are, this season is actually lower than the 10-year average for the same period, according to NIFC. So far this year, there have been a total of 40,883 fires, a number below the 10-year average of 43,456, according to the data from NIFC. The total acreage burned since the beginning of the year is 4,645,058, compared with the 10-year average of 5,680,220 acres, the NIFC said.