Forecasters warned that swells generated by Rosa will affect portions of the southwestern Mexican coast and southern Baja California into the weekend, causing life-threatening surf and rip current conditions.
Early Saturday, Rosa was about 625 miles (1,005 kilometers) south-southwest of Punta Eugenia with maximum sustained winds of around 100 miles per hour.More news: Robots send new images, first footage from asteroid’s surface
It was about 585 miles (940 km) southwest of San Felipe Mexico at 2 a.m.
There is increasing confidence that high-grade tropical moisture from Hurricane Rosa may drift into northwest Arizona, southern Nevada and southeast California by Monday morning.More news: 50 million Facebook accounts affected by security vulnerability
The rain could lessen as the storm moves toward Arizona, but it could also bring a small dust storm Sunday evening.
Rosa is expected to make landfall Monday as a tropical storm, then continue moving northeast, soaking the southwestern United States. The hurricane center also warned of heavy rains for St. Croix and Puerto Rico, which was badly damaged by Hurricane Maria a year ago and is still recovering from the storm. The storm is expected to become a tropical depression Friday night and degenerate into a low pressure trough by late Saturday. The North Rim could see up to 6 inches.More news: Quake jolts central Sulawesi in Indonesia
The heaviest rain will fall on Tuesday as the forecast predicts the center of the remnant hurricane could pass close to Phoenix, but Matthew Hirsch, a meteorologist at the NWS in Phoenix, said heavy rain will be widespread regardless of where the center ends up.