NWS Forecast Office Phoenix, AZ

The unsettled pattern over the Southwest US continues, as yet another weather system dives southwest of the region Friday and brings rain chances through Sunday evening as it slowly progresses northeastwards through AZ. Due to this system's unique trajectory, the locations most favored for higher multi-day rainfall totals will be Southwest AZ and Southeast CA. Multiple rounds of showers can be expected, with the highest rainfall rates likely Friday as dynamic forcing ahead of the system is maximized. A few isolated thunderstorms cannot be ruled out.

Another weather system is expected to bring additional rainfall in SE CA and SW AZ, with forecasted rainfall totals between 0.75-1" with isolated areas in excess of 1". The Weather Prediction Center (WPC) has put these areas under a Slight Risk for excessive rainfall starting Friday morning.