Dangerous winds returned to the region Tuesday as new wildfires broke out in San Diego and a pair of major Los Angeles-area blazes burned for a third week, while officials made preparations to protect scorched neighborhoods from toxic ash runoff ahead of potential rain this weekend.

A new fire broke out near Los Angeles’ Bel Air neighborhood early on Thursday as the Hughes fire which was first reported a day earlier in northern Los Angeles County grew rapidly to set ablaze more than 10,000 acres, prompting authorities to issue evacuation orders and warnings to more than 50,000 people.

A fast-moving wildfire exploded to roughly 10,200 acres near the Los Angeles County community of Castaic Wednesday morning, prompting mandatory evacuation orders and road closures, authorities said.