PHOENIX -- With the assist from an early season Pacific low pressure system, it looks like the monsoon is going to be pretty active this week. As a result, a lot of moisture is going to be pulled into Arizona from the south, and it looks like for much of the week, we’ll have a chance for thunderstorms.
Right now, the forecast models are coming together for the next couple of days, which we expect to be very active. Around the Valley, the Weather Service puts the chance of measureable rain at 50 percent overnight, 40 percent tomorrow and 30 percent tomorrow night for metro Phoenix.
The early season Pacific low pressure system will approach the area today and will draw even more monsoon moisture northward back into Arizona. More widespread shower and thunderstorm activity is expected across Arizona from late tonight through much of this week. With the increase in humidity and clouds, below-normal temperatures are expected for the rest of the workweek.
Late week, and over the weekend, we’re also seeing signs of another significant outbreak of storms, but it’s too early to start fine tuning the timing of those storms just yet.