Hurricane Karina strengthened Monday into a powerful Category 4 storm in the Pacific Ocean but isn't threatening land, forecasters said.
The storm has intensified quickly since becoming a hurricane Sunday and has been fueled by warm waters far offshore, the U.S. National Hurricane Center in Miami said.
Karina was about 1,020 miles (1,642 kilometers) west-southwest of the southern tip of the Baja California peninsula of Mexico and had maximum sustained winds of 145 mph (233 kph), the center said. It was moving west.
There were no coastal watches or warnings in effect, but waves were expected to affect Mexico and likely Southern California. Additional strengthening was possible on Monday, followed by fluctuations in intensity.
