A stunning time-lapse video showed the furious growth of a wildfire raging northwest of Los Angeles as nearly 20,000 people were told Sunday they’ll have to flee if it spreads further south. A huge plume of thick smoke spewed from the hilly rural terrain in images captured over the course of seven hours on Saturday, according to timestamps on the 1 1/2 minute clip posted on X, formerly Twitter. Director and Fire Chief Joe Tyler of the California Department of Forestry and Fire Protection called it a “stark reminder” of why officials work to prevent wildfires across the Golden State. Some 19,00…