Hurricane Rosa moved toward Baja California on Saturday night. At 11:00 p.m. EDT on Saturday the center of Hurricane Rosa was located at latitude 22.4°N and longitude 118.9°W which put it about 440 miles (710 km) south-southwest of Punta Eugenia, Mexico. Rosa was moving toward the north at 12 m.p.h. (19 km/h). The maximum sustained wind speed was 100 m.p.h. (160 km/h) and there were wind gusts to 120 m.p.h. (195 km/h). The minimum surface pressure was 969 mb.
A Tropical Storm Warning was in effect for the portion of the coast from Punta Abreojos to Cabo San Quintin, Mexico. A Tropical Storm Watch was in effect for the portion of the coast from Bahia de los Angeles to San Felipe, Mexico.
Hurricane Rosa will move into an environment unfavorable for hurricanes on Sunday. Rosa will move over water where the Sea Surface Temperature is cooler than 26°C. In addition an upper level low near the west coast of the U.S. will produce southwesterly winds which will cause vertical wind shear. The combination of cooler water and more vertical wind shear will cause Hurricane Rosa to weaken. Rosa could weaken to a tropical storm by Sunday night.
The upper low will steer Hurricane Rosa toward the northeast during the next several days. On its anticipated track Rosa could reach Baja California on Monday. It will likely be a tropical storm at that time. Even though it will weaken, Rosa will drop heavy rain over parts northern Baja California and the southwestern U.S. The heavy rain could cause flash floods.
Elsewhere over the Eastern North Pacific Ocean Tropical Storm Sergio formed southwest of Acapulco, Mexico. At 11:00 p.m. EDT on Saturday the center of Tropical Storm Sergio was located at latitude 12.3°N and longitude 103.3°W which put it about 390 miles (630 km) southwest of Acapulco, Mexico. Sergio was moving toward the west at 10 m.p.h. (16 km/h). The maximum sustained wind speed was 45 m.p.h. (75 km/h) and there were wind gusts to 60 m.p.h. (95 km/h). The minimum surface pressure was 1003 mb.