Below is the MJO forecast for the next 40 days. Orange indicates favorable MJO conditions. As you can see below, a mass of orange is moving across the Pacific Ocean through the rest of June and into early July. By late July, the MJO arrives over the ocean waters west of Central America. If this MJO forecast plays out as seen below, tropical activity in the East Pacific Ocean could ramp up about a month from now. This can then ramp up monsoon action in Arizona a few days to a week later.