00:49 Florida Barrier Island is Now Three After Hurricane Sally A remote section of beach on Perdido Key is now three separate islands after Hurricane Sally impacted the Gulf Coast.

At a Glance The remnant of former Hurricane Rosa is spreading rain into the southwestern U.S.

The rain could trigger dangerous flash flooding in some areas.

Rain from the remnants of former Hurricane Rosa will continue to soak the Southwest and may trigger dangerous flash flooding in parts of the region through Tuesday.

Moisture from Rosa has been fueling rain in the Southwest since Sunday afternoon.

Yuma, Arizona, picked up 0.91 inches of rain Sunday and Monday. That's about a quarter of the annual average rainfall in the southwestern Arizona city (3.56 inches).

Phoenix recorded 2.63 inches of rain from Rosa Sunday through Tuesday afternoon . With 2.24 inches of rain falling on Tuesday alone, it became the second-wettest October day on record and the ninth-wettest day all-time in Phoenix , according to the National Weather Service.

Road flooding was reported in the Phoenix metro area Tuesday morning near Glendale and Surprise. A swift water rescue was also reported in Ak-Chin Village.

(LATEST NEWS: Drivers Stall on Flooded Roads in the Southwest )

Through Tuesday, rain and thunderstorms will affect parts of Arizona, southeastern California, southern and eastern Nevada, Utah and perhaps northwestern New Mexico and parts of western Colorado.

Flooding could occur in urban areas, normally dry washes, small streams and slot canyons. Debris flows are also possible near recent wildfire burn scars.

The National Weather Service has issued flash flood watches from western and central Arizona into eastern Nevada, southeastern California, Utah, southwestern Colorado, far southeastern Idaho and extreme southwestern Wyoming. This includes Phoenix, Flagstaff and Salt Lake City.

The National Hurricane Center expects 2 to 4 inches of rainfall in central and southern Arizona, with isolated amounts up to 6 inches possible in the mountains of central Arizona. Elsewhere across the Desert Southwest, central Rockies and the Great Basin, 1 to 2 inches, with isolated totals up to 4 inches, are anticipated.

Although separate from Rosa, parts of coastal and interior California will see rain Tuesday into Wednesday from the area of low pressure that helped lift Rosa toward the southwestern United States. That area of low pressure will also continue the chance of showers and storms across the interior West on Wednesday as tropical moisture from Rosa remains in place.

Although flooding is a concern, some of this rainfall will likely be beneficial since the Southwest is currently experiencing drought conditions. According to the U.S. Drought Monitor, just over 40 percent of Arizona is experiencing at least extreme drought , the second-highest category.

Swells from Rosa will contribute to life-threatening surf and rip-current conditions for portions of the Southern California coast through Tuesday.

Rosa's History

Rosa became a hurricane last Wednesday morning in the eastern Pacific Ocean just under 500 miles south-southwest of Cabo San Lucas, Mexico.

Rosa rapidly intensified into a major hurricane by last Thursday afternoon. Rapid intensification is defined as an increase in maximum sustained winds of at least 35 mph in 24 hours or less. Rosa nearly doubled that rate of intensification.

At its strongest, Rosa was the seventh Category 4 hurricane of the 2018 eastern Pacific hurricane season, tying the record recently set in 2015.

The final advisory for Rosa was issued by the National Hurricane Center Tuesday morning.