One area of Arizona received 3.64 inches, the weather service said.
Meteorologist Matthew Strauser filmed a video of the tropical storm, formerly a hurricane before it weakened over the weekend, as it hit his location.
A southern Arizona dam that had been at risk of breaking and flooding a small village held steady Wednesday as the lake behind it receded after being swollen with runoff from the remnants of Tropical Storm Rosa.
According to the National Weather Service, by the time Phoenix had reached 2.36 inches of rainfall at Phoenix Sky Harbor International Airport on Tuesday evening, Phoenix had marked the not only the rainiest Oct. 2 in its weather history, but the wettest October day ever.
Meanwhile, a separate storm, Hurricane Sergio, grew to major hurricane status in the Pacific on Tuesday, though it posed no immediate threat to land. About 10 vehicles including a bus were at a standstill in the water or trying to drive through it.
The storm was about 120 miles (190 km) south-southwest of San Felipe, Mexico.
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The storm has maximum sustained winds of 50 mph, with tropical-force winds extending about 150 miles from its center. Several school systems in Mexico's Baja Peninsula were closed Monday as the storm approached the region.
The rain also forced the closure of one intersection and three elementary schools in the Valley.
A separate flash flood warning was issued through Thursday morning for Yavapai County north of Phoenix due to possible thunderstorms.
The Utah National Guard was activated Monday to assist in flood mitigation efforts in Utah County.
By Tuesday afternoon, Rosa will head toward the deserts of Arizona.
"All that means is conditions are favorable for flash flooding if it rains", Rogers said.
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Flash flood watches are in effect for parts of Arizona, far southern California, Nevada, Utah, Colorado and far southern Idaho, with the storm's remnants moving inland, the National Weather Service said.
Ali Chuk, a Native American community with 162 people, had been evacuated Tuesday night.
More of the moisture from Rosa is expected to drop over New Mexico and Arizona, where residents are bracing for what could be significant flooding and mudslides in desert areas not prepared to absorb the drenching.
Tuesday's rain differed from a monsoon in that it did not bring widespread wind and lightning, but rather a steady, prolonged rainfall in many areas.
It'll drench Baja California with 3 to 6 inches of rain, with some spots getting up to 10 inches, the National Hurricane Center said.
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