Tropical Storm Hilary strengthened into a hurricane Thursday, with forecasters warning it could potentially bring devastating rainfall and high winds to Southern California this weekend. The last tropical storm to impact the state was 84 years ago, according to official records.

The National Hurricane Center said Hilary was about 320 miles south of Manzanillo, Mexico, as of Thursday morning, with maximum wind gusts of 75 mph. While Hilary is likely to weaken as it travels northward, it could bring heavy rainfall to the southwestern United States, along with large swells and high surf along the coast.

There is currently a tropical storm watch in effect for parts of Mexico before it approaches the Baja California peninsula this weekend.

The National Hurricane Center is warning that the storm could produce up to 8 inches of rain across the peninsula through Monday morning, with the potential for flash flooding.

“Hilary has the potential to bring significant impacts to the Baja California Peninsula and portions of the southwestern United States this weekend and early next week, including after it becomes post-tropical,” the center said.

“Although it is too soon to determine the location and magnitude of wind impacts, interests in these areas should monitor the progress of Hilary and updates to the forecast.”The center noted that the peak rainfall will occur Sunday and Monday.