Maricopa County Forecast
Risk Scale
Air Quality Dust RiskUPDATED: Thu. Apr 19, 2018 12:44 PM
This report is updated Monday through Friday and is valid for Maricopa County, Arizona
Friday 4/20/2018

LOW
Winds:Northwesterly winds 10-25 mph.
Stagnation:No stagnation
Saturday 4/21/2018

LOW
Winds:Light winds beccoming southwesterly 5-15 mph for the afternoon.
Stagnation:Morning and evening stagnation.
Sunday 4/22/2018

LOW
Winds:Light winds beccoming southwesterly 5-15 mph for the afternoon.
Stagnation:Morning and evening stagnation.
Monday 4/23/2018

LOW
Winds:Light winds beccoming southwesterly 5-15 mph for the afternoon.
Stagnation:Morning and evening stagnation.
Tuesday 4/24/2018

LOW
Winds:Light winds beccoming southwesterly 10-20 mph for the afternoon.
Stagnation:Morning and evening stagnation.


Synopsis & Discussion
Forecaster: -J. Malloy
Widespread gusty winds on the way. Likeliest period of blowing dust is midafternoon and early evening before sundown. Southwesterly flow puts areas adjacent to open deserts and aligned with dry dust sources, such as the Salt River drainage, at higher risk to see blowing dust.

Modelled air parcel trajectories also reveal an afternoon connection between Phoenix and southern California, where blowing dust is underway this morning. Long-range haze transport is on the horizon later today for us. Winds settle down along with PM-10 concentrations overnight. Any haze when we wake up gets kicked out with breezy northwesterly winds Friday.

Stagnation sets up Saturday, Sunday, and Monday. Local accumulation of pollutants need to be watched; however, there is no change to the Low risk at this time.
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Phoenix, AZ 85007
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