The California wildfires could soon reach a dangerous milestone by hitting 4 million acres this year, according to the Associated Press. The fires have already killed 31 people and destroyed hundreds of homes and is the worst fire season on record.

“We’re at a historic moment where we are going to cross the 4 million acres burned mark in California this year,” Cal Fire Deputy Chief Jonathan Cox said. “And unfortunately, we’re just getting into some of the most critical fire months in California.”

About 17,000 firefighters have been battling nearly two dozen major blazes. Most all of the damage has occurred since around mid-August, when five of the six largest fires in California’s history erupted. Lightning strikes caused some of the blazes, but a pyrotechnic device used at a gender reveal party sparked the massive El Dorado Fire in Southern California, according to The New York Times. It has so far burned more than 22,000 acres, according to ABC7 News.

Fire officials said the Glass Fire, which erupted in Northern California on Sunday, has been a priority. It has destroyed nearly 600 buildings, including 220 homes and about the same number of commercial buildings. About 80,000 people have been under evacuation orders, and officials warn that number could increase.

However, the situation may improve soon as some rainfall is expected as a result of Hurricane Marie which could possibly weaken by the middle of the week, but leftover tropical moisture could hit Northern California, according to weather forecasters.