Stagnation: Light morning stagnation and evening stagnation
Wind: Light breezes early in the morning, 5-15 mph, becoming more light and variable later in the day
Sunday
Stagnation: Morning and evening stagnation
Wind: Mostly light winds
Monday
Stagnation: Morning and evening stagnation
Wind: Easterly winds in the morning, becoming more southerly in the afternoon, 5-15 mph
Tuesday
Stagnation: No stagnation
Wind: Southerly winds in the morning, becoming more westerly throughout the day, 10-25 mph with higher gusts
Wednesday
Stagnation: Morning and evening stagnation
Wind: Mostly light winds
Discussion
After a fairly quiet week, the weather pattern over the western U.S. will enter into an active phase again.
Today (Friday), a low-pressure wave advancing into Arizona will kick things off, bringing in cooler air and a brief pulse of moisture that will give Phoenix some rain chances this afternoon. In fact, gusty thunderstorm winds out the south are looking more and more likely. These winds could result in brief blowing dust, then help initiate rain. Any rain will help to drop dust (PM10) levels back down.
Then for Saturday and Sunday, things will calm down a bit. The main weather story will be much cooler temperatures (highs in the low/mid 70s) in the wake of today's wave. Cloud cover should also linger into Saturday, then clear up more by Sunday. During this time, local PM10 levels should remain relatively low.
Then by Monday, PM10 will likely increase in the morning from local activities, namely in the industrial area south/southwest of Phoenix. But by Tuesday, our next weather system will arrive, bringing in another round of rain. Rain will help to reduce PM10 once again.
For now, the dust risk is Low each day.
Check back again on Monday morning for the next dust risk outlook.
