Maricopa County Forecast
Risk Scale
Air Quality Dust RiskISSUED ON: Thu. Feb 22, 2018
This report is updated Monday through Friday and is valid for Maricopa County, Arizona
Friday 2/23/2018

MODERATE
Winds:Light winds becoming southwesterly 15-25 mph by afternoon, with higher gusts
Stagnation:Morning stagnation
Saturday 2/24/2018

LOW
Winds:Light winds becoming southwesterly 5-10 mph for the afternoon
Stagnation:Morning and evening stagnation
Sunday 2/25/2018

LOW
Winds:Mainly light winds
Stagnation:Morning and evening stangation
Monday 2/26/2018

LOW
Winds:Light winds becoming southwesterly 5-15 mph for the afternoon
Stagnation:Morning and evening stangation
Tuesday 2/27/2018

LOW
Winds:Light winds becoming southwesterly 10-20 mph by afternoon, with higher gusts possible
Stagnation:No stagnation


Synopsis & Discussion
Forecaster: -J. Malloy
Phoenix air quality is not too bad! Only one PM-10 monitor hit the Moderate AQI level on Wednesday in the southern part of the metropolitan. Latest AQ trends are faring even better than yesterday through the early morning period.

Weather is to become active over the next day. Afternoon breezes increase today out of the west as a Pacific disturbance tracks down the Great Basin toward Arizona. This helps with atmospheric ventilation rates.

On Friday the pressure gradient tightens to a maximum as the Pacific storm takes its closest approach to the state. Winds will turn gusty by the afternoon hours, again from the west. This storm is different from the one earlier this week in regards to reduced areal coverage and duration of gusty winds. Only brief lofted dust/haze is expected. The inland trajectory of the disturbance is terrible for carrying moisture making rain chances minimal for the deserts. A Moderate dust risk remains forecasted for Friday.

A lull in weather systems lasts through the weekend. Dust risk levels drop back to low.
Useful Links
- Subcribe to the Forecast
- Read current issue of "Cracking the AQ Code"


Main Office
1110 W.Washington Street
Phoenix, AZ 85007
P: 602.771.2300
azdeq.gov