Other fires raging in the state include the Mendocino Complex.
"Grass Valley firefighters found a dish and provided the two newfound friends with fresh water", Grass Valley Fire Fire Chief Mark Buttron wrote in an online post.
The fire is 196 square miles - more than three times the size of the city of Redding.
The fire was burning in federal forest land and a handful of residents in the area were warned Tuesday night to evacuate, said Mendocino County sheriff's Lt. Shannon Barney.
Mercy Medical Center said it was fully operational - even though dozens of employees, physicians or volunteers lost homes in the fire.
California firefighters made a surprising discovery as they were helping residents deal with the aftermath of the deadly Carr wildfire that has destroyed more than 1,000 homes.
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Of the 20 people reported missing as of Monday, all have now been accounted for. The nearby Ranch Fire also broke out Friday and has burned almost 75,000 acres.
"People are doing everything they can, but nature is very powerful and we're not on the side of nature", Brown said.
Just a month into the budget year, California has already spent more than one-quarter of its annual fire budget, at least $125 million, state Department of Forestry and Fire Protection spokesman Mike Mohler has said.
"We're being surprised. Every year is teaching the fire authorities new lessons", Governor Jerry Brown told reporters.
In and around Redding to the north, some evacuees were allowed to return to neighborhoods where more than 1,000 homes were torched.
In the Redding area, where the Carr Fire has killed six people, including two firefighters, fierce winds of 25 miles (40 km) per hour, temperatures above 95 degrees Fahrenheit (35 Celsius) and extremely low humidity were in the forecast from Thursday evening until Saturday, the National Weather Service said.
Weather conditions are doing nothing to aid firefighters in tackling the blaze, as fierce winds fan the flames further.