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Tropical Storm Rosa will still pack a punch to southern California, Arizona

Tropical Storm Rosa will still pack a punch to southern California, Arizona

The National Oceanic and Atmospheric Administration (NOAA) has outlined the storm is set to stir both powerful winds and rain is it enters the mainland US.

Tropical Storm Rosa neared Mexico's Baja California on Monday, spreading heavy rains that were projected to extend into a drenching of the U.S. Southwest.

Hurricane Rosa is on track to drench northwest Mexico and parts of the southwest USA, prompting tropical storm warnings for the Baja California coast and flash flood alerts for parts of four U.S. states.

Rosa was packing 50 mph (85 kmh) winds and was about 140 miles (225 km) west southwest of Punta Eugenia, Mexico at 2 a.m. Monday, Pacific time, the NHC said.

At the moment, there is a tropical storm warning out for a 291 mile stretch on the west coast of Baja California.

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Meanwhile, Tropical Storm Sergio was growing in the Pacific and could become a hurricane force Monday, though it posed no immediate threat to land. A tropical storm watch was in effect for the peninsula's east coast, from Bahia de los Angeles to San Felipe.

The storm is expected to drop 3-to-6 inches of rain, with isolated spots of 10 inches of rain in the next few days, the weather service said.

It's then expected to move quickly northwestward as it weakens, bringing 2 to 4 inches of rain to the Mogollon Rim of Arizona and 1 to 2 inches to the rest of the desert Southwest, Central Rockies and Great Basin. "These rainfall amounts may produce life-threatening flash flooding", the hurricane center said in an advisory early Monday.

Off the coast of affected areas is the strong possibility of deadly surf, where large swells may impact Baja California peninsula coast and spur rip-current conditions.

Sergio is moving to the west at 14 miles per hour, and is expected to move away from North America into the Pacific Ocean.