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.

Additional water tankers and scores of firefighters arrived at the Los Angeles area on Monday ahead of fierce winds that were forecast to return and threaten the progress made so far on two massive infernos that have destroyed thousands of homes and killed at least 24 people.