Mandatory evacuations were in effect for about 1,300 residents.

Don Silver said a neighbor alerted him to the danger by banging on his door in the middle of the night. That's when he saw \"flames like 40 to 50 feet high.\"

\"It's scary,\" Silver told ABC News. \"You just want to get out, run. You don't pick up nothing.\"

\"PHOTO:
Noah Berger/AP
PHOTO: A firefighter sprays water as embers threaten a residence as the Hillside fire burns through San Bernardino, Calif., Oct. 31, 2019.
>

My poor grandpa and uncle. Unc just sent this video prior to their evac (this is their exact neighbor). Tons of smoke damage.. Heartbreaking to hear a live stream evac and then hear about them sitting in a parking lot at a grocery store, and it's cold too! WTH??? #HillsideFire pic.twitter.com/hHc0PI6gG6

— Vryimpatnt (@Henri__Moser) October 31, 2019

The fire has the potential to move so quickly that \"if folks don't evacuate when we ask them to, it'll be very difficult to try to get them out when the fire is moving toward their homes,\" Kathleen Opliger, San Bernardino County Fire's Interim Deputy Chief of Operations, said Thursday.

She said it's \"absolutely imperative that folks go when we ask them to go.\"

The Hillside Fire was 50% contained Thursday afternoon. One firefighter was injured.

#HillsideFire (Update): IC reporting 50% containment & approx 200 acres. 1 firefighter transported to area hospital for smoke inhalation. Crews will remain on-scene reinforcing containment lines & completing mop up. Continued unified command w/ @SanBernardinoNF & @SanBernardinoPD pic.twitter.com/5qYbpEZa1w

— SB County Fire (@SBCOUNTYFIRE) October 31, 2019

The 46 Fire -- the result of a police chase and crash -- erupted in nearby Riverside County shortly after midnight on Thursday, destroying at least five structures.

The winds sent embers flying, falling dangerously close to horses below. It's spread to 300 acres and is 5% contained.

The 46 Fire comes one day after the Hill Fire started in Riverside County, forcing the elderly to evacuate a healthcare center. The Hill Fire has since reached 80% containment.

\"PHOTO:
Will Lester/Orange County Register via Zuma Press
PHOTO: Elderly residents of the Riverside Heights Healthcare Center in Jurupa Valley, Calif. are evacuated from their care facility as flames and smoke from the Hill Fire approach, Oct 30, 2019.
>

Riverside County Fire Department spokesman Jeff LaRusso said firefighters are battling fatigue as more blazes pop up.

\"I had four hours of sleep from the fire I was on yesterday. And that's probably four more hours than some of these guys have had,\" he told ABC News Thursday. \"Hate to say that we're used to it... we're just gonna power through.\"

In Simi Valley, where wind gusts peaked at 70 mph, winds propelled the roaring Easy Fire to 1,700 acres. Firefighters Wednesday worked to defend the Ronald Reagan Presidential Library against the flames.

\"PHOTO:
Wally Skalij/Los Angeles Times/Polaris
PHOTO: A water-dropping helicopter passes makes a drop along Madera Road as the Easy Fire burns in Simi Valley, Calif., Oct. 30, 2019.
>
\"PHOTO:
Wally Skalij/Los Angeles Times / Polaris
PHOTO: President Ronald Reagan's Air Force One sits on display at the Reagan Library as the Easy Fire burns in the hills, Oct. 30, 2019, in Simi Valley, Calif.
>

Roughly 7,000 homes were evacuated after the fire started on Wednesday. The blaze is 10% contained.

Crews continue to battle the #EasyFire in @City_SimiValley both on the ground and in the air despite the high winds. Progress will continue to be updated here. #lacofdpio #lacofd
📸 BC Buzz pic.twitter.com/0GicznrmMM

— L.A. County Fire Department (@LACoFDPIO) October 30, 2019

Winds are weakening in Southern California Thursday afternoon and should be calmer on Friday, helping crews fight the flames.

...Meantime in Fontana! 💨💨💨 Video from #abc7eyewitness Alicia Alvarado! #RedFlagWarning pic.twitter.com/TE5Q6bYzXC

— Marc Cota-Robles (@abc7marccr) October 31, 2019

Meanwhile, the monster Kincade Fire in Northern California's Sonoma County has covered 76,800 acres.

The blaze has been burning since Oct. 23, but has now climbed to 60% containment as the winds weaken.

\"PHOTO:
Andrew Morgan/NASA
PHOTO: International Space Station astronaut Andrew Morgan captured photos of the California wildfires burning north of the Bay Area, Oct. 30, 2019.
>

The Kincade Fire burned 141 homes and is still threatening over 90,000 structures.

Four firefighters have been injured.

Over 5,000 people remained under evacuation orders as of Wednesday night.

ABC News' Rachel Katz, Jenna Harrison and Alyssa Pone contributed to this report.

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