The US Navy’s NoGAPS precipitation model is predicting a massive rain event for next Tuesday. During a 6 hour period in the morning, the model shows much of Central Arizona in the 25+mm precipitation band. It’s unusual for the Navy model to predict this much rain this time of year. During monsoon season it is often the least accurate model, show next to no rain most of the time. The 6 hour time periods before and after also show large precipitation amounts. The GFS model does not predict similar amounts.
I think this is an oddity, not a real expectation. Broadly, next week most forecasts call for much cooler and wetter conditions.