Tropical Storm Olaf is building strength in the Eastern Pacific and is expected to become a hurricane as early as tonight, the National Hurricane Center in Miami said.

At 5 p.m., Olaf was about 1,685 miles west-southwest of the southern tip of Baja, Calif. Olaf was moving west at 9 mph with maximum sustained winds of 65 mph.

Tropical storm force winds extend outward up to 60 miles, officials said.

Forecasters say a decrease in forward speed is expected later today with a turn to the west-northwest on Sunday.

Olaf is forecast to become a hurricane tonight or Sunday and be near major hurricane strength on Monday.

It’s too far away to know if it will have an effect on Hawaii’s weather.