More than 1,000 firefighters are battling that blaze, which has scorched 7,500 acres and is only 5% contained.
Redding, a city of 92,000 near the OR border, is at grave risk from the Carr fire, which has so far killed two people. No other details were provided.
The tragic result of this explosion was the death of a bulldozer operator who was battling the blaze.
In Southern California, thousands remained evacuated as a suspected arson wildfire burned in the San Jacinto Mountains east of Los Angeles.
"It occurs when ground level winds come into contact with a fire and whip it into the air, creating a tornado-shaped spiral of flames", explained Cal Fire spokesperson Heather Williams.
Firefighters face a hard task in the days ahead, with dry conditions and temperatures expected to reach 110 F on Friday.
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Two other major fires are also burning in the state. One of those prompted the closure of much of Yosemite National Park in California.
Authorities say it is now almost 72 square miles (186 square kilometers), but containment has increased to 29 percent.
Videos posted to social media show long lines of cars slowly moving on a highway near the city of Redding as the wildfire rages on the hills behind.
Huston says officials are moving emergency supplies including cots and food to four shelters set up in Shasta County.
Allison Woods and Tamara Damante were providing live coverage of the fire for KRCR-TV in Redding when they announced the blaze was approaching their studio and they needed to leave.
More than 20,000 residents have been ordered to evacuate as the Carr Fire continues to descend on Redding, destroying everything in its path, and as with last year's devastating Tubbs Fire in Sonoma County, locals are wondering what they can do to help. He said the man's body was found late Thursday.
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The fire in Shasta County was estimated at more than 31 square miles (80 square kilometers) Thursday morning.
Residents in Shasta County have been urged to evacuate, with the mandatory evacuations increasing as the fire grows.
Redding hospital has been evacuated - with at least five infants being rushed out and some babies being airlifted to hospitals in Sacramento.
An explosive Northern California wildfire surged into the city of Redding, population about 92,000, on Friday after burning dozens of homes, injuring firefighters and civilians, and engulfing and killing a bulldover operator.
Flames swept through the communities of Shasta and Keswick before jumping the Sacramento River and reaching Redding, a city of about 90,000 people - the largest in the region.
Director Kyle Pickett is now leaving the Redding area after an evacuation order.
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