The threat of powerful wind gusts, combined with bone-dry humidity, in Los Angeles on Wednesday could test firefighters who have been battling to keep monstrous fires in Los Angeles in check since last week.

The Eaton Fire burning just north of Los Angeles and the Palisades Fire that destroyed much of the seaside LA neighborhood of Pacific Palisades broke out Jan. 7 in conditions similar to what’s expected Wednesday. High winds last week pushed flames at remarkable speed and carried fire-sparking embers sometimes miles away.