We're tracking big changes in the forecast for next week as a series of low pressure systems impact Arizona with rain and cooler weather.

Right now, a shortwave disturbance that's overriding high pressure is bringing clouds into the state. Mostly to partly cloudy skies are on tap today and Saturday, but no rain is expected from these clouds and afternoon highs will remain five to ten degrees above normal with Phoenix topping out at 83 today.

This weekend, what is currently Tropical Depression 20-E, will form into a tropical storm and then weaken again to a tropical depression just south of Baja. As this happens, an area of low pressure just northwest of that will become cutoff from the main jet stream and draw up some of that moisture.

Arizona will stay dry, with sunshine returning for Sunday and Monday, but by Tuesday, another low pressure system will dig down from the northwest and intermingle with the moist low near Baja. This will set the stage for rain chances beginning Tuesday evening through at least next Friday.

As of this update, forecast models indicate one to two inches of rain possible for the Valley, with higher amounts for the mountains north of Phoenix.

As for snow, snow levels still look to be pretty high.

Temperatures will take a dramatic drop as the rain moves in. For the Valley, highs in the low 80s Tuesday will drop to the upper 60s Wednesday and the mid 60s Thursday.

Stay tuned for updates!

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