Residual moisture in the atmosphere combined with solar heating will bring weak instability the next couple of days, the possibility of isolated high-based showers to continue developing, mainly in the afternoon hours.
Then, a storm system will move across Arizona this Wednesday evening through Friday morning, bringing another round of breezes, cooler temperatures, and a chance of showers or thunderstorms. The snow levels will generally remain above 6,000’, although on Thursday evening to Friday morning, we may see a brief changeover to snow. There will also be some weak instability in the atmosphere, leading to the slight chance for thunderstorms. Precipitation amounts will generally be between 0.2 – 0.4”.
Another weak disturbance will keep things unsettled over the weekend, possibly with isolated high-based showers. Otherwise, improving weather will occur over the weekend and into next week.
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Official National Weather Service forecast