Fiona strengthened into the third hurricane of the 2022 Atlantic hurricane season just hours before making landfall in Puerto Rico on Sunday, but the worst of the storm isn’t over yet with AccuWeather meteorologists predicting feet of rain that could cause life-threatening flash flooding and mudslides.

Landfall occurred at 3:20 p.m. EDT on Sunday on the extreme southwestern coast of Puerto Rico near Punta Tocon. Fiona was a Category 1 hurricane on the Saffir-Simpson Scale with maximum sustained winds of 85 mph.

Hurricane warnings remain in effect for all of Puerto Rico, as well as eastern portions of the Dominican Republic. AccuWeather forecasters have rated Fiona a 2 for the Caribbean on the AccuWeather RealImpact™ Scale for Hurricanes as a result of the heightened risk to life and property from the storm’s strong winds and heavy rain, which can amount up to 24 inches (600 mm) in some spots.

At 3:35 p.m. EDT Sunday, Fiona was a Category 1 hurricane packing maximum sustained winds of 85 mph (140 km/h), with even higher gusts. The center was 15 miles (25 km) south-southeast of Mayaguez, Puerto Rico.

The entire power grid in Puerto Rico went down on Sunday, creating an island-wide crisis. Every one of the nearly 1.5 million power customers across the island was in the dark. Ahead of Fiona, beaches in Puerto Rico were shut down and officials opened shelters, according to The Associated Press. Theaters and museums were also closed as Fiona approached and officials cautioned residents to stay indoors as conditions deteriorate. As the governor on Saturday urged residents not to underestimate Fiona, the lights briefly went out while TV cameras were rolling.