A flash-flood watch is in effect for the Valley and most of southern Arizona until 2 a.m. Thursday. 

The National Weather Service says scattered showers and thunderstorms capable of producing heavy rain and flash flooding are expected to develop Wednesday afternoon and into the night.

Larry Hopper, meteorologist with the National Weather Service, said areas of the Valley and elsewhere that have received heavy rainfall in recent days are particularly susceptible. 

A flash-flood watch means that flooding is possible in washes, creeks and other drainage areas within the designated area. A flash-flood warning is issued when flooding is a certainty.

The Valley has about a 30 percent to 40 percent chance of rain Wednesday, Hopper said, adding that those chances decrease to about 20 percent Thursday and Friday. 

Hopper said anyone outdoors during heavy rain should be aware of their surroundings and turn around when faced with a flooded roadway.

Flash floods are dangerous and can be deadly. Nine members of a Valley family perished when a “40-foot-wide black wave” of rainwater, mud and debris tore through a narrow canyon and swept them away in 2017.

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