https://phys.org/news/2018-10-remnants-tropical-storm-phoenix-cars.html

The National Weather Service issued a flash flood warning for the Phoenix area, saying that more than 2 inches (5 centimeters) of rain fell in metro Phoenix by midmorning and additional rain was expected. The day has already made it one of the wettest Octobers Phoenix has seen, the agency said.

The city sees sudden and heavy downpours during the summertime monsoon, but the continuously falling rain is a rarity.