Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Wednesday Forecast:

Alert: Ozone High Pollution Advisory in effect for Wednesday

Ozone

112 AQI
Max 8-hr Avg: 74 ppb

PM10

60 AQI
24-hr Avg: 73 µg/m3

PM2.5

50 AQI
24-hr Avg: 11.9 µg/m3

Thursday Forecast:

Alert: Ozone High Pollution Advisory in effect for Thursday

Ozone

122 AQI
Max 8-hr Avg: 77 ppb

PM10

59 AQI
24-hr Avg: 71 µg/m3

PM2.5

40 AQI
24-hr Avg: 9.5 µg/m3

Friday Forecast:

Alert: Ozone High Pollution Watch in effect for Friday

Ozone

101 AQI
Max 8-hr Avg: 71 ppb

PM10

57 AQI
24-hr Avg: 68 µg/m3

PM2.5

33 AQI
24-hr Avg: 7.9 µg/m3

Saturday Forecast:


Ozone

84 AQI
Max 8-hr Avg: 65 ppb

PM10

55 AQI
24-hr Avg: 64 µg/m3

PM2.5

36 AQI
24-hr Avg: 8.7 µg/m3

Sunday Forecast:


Ozone

77 AQI
Max 8-hr Avg: 63 ppb

PM10

47 AQI
24-hr Avg: 51 µg/m3

PM2.5

30 AQI
24-hr Avg: 7.3 µg/m3

Air Quality By Pollutant:

Pollutant
Wednesday
5/12/2021
Thursday
5/13/2021
Friday
5/14/2021
Saturday
5/15/2021
Sunday
5/16/2021
O3
112
122
101
84
77
PM10
60
59
57
55
47
PM2.5
50
40
33
36
30
Pollutant
WED
THU
FRI
SAT
SUN
O3
112
122
101
84
77
PM10
60
59
57
55
47
PM2.5
50
40
33
36
30
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

If you like triple-digit heat, you will like this forecast. If you don't like the heat, you have about 146 days until Oct 5th, which is the average last 100-degree day.

High pressure currently located along the West Coast of the United States will shift eastward and be centered over the state tomorrow through early Friday. This pattern will result in mainly clear skies, light winds, and afternoon high temperatures rising back into the 100 to the 103-degree range today through Friday.

This weather setup will also result in the perfect recipe for ozone formation (light winds, clear skies, and long daylengths), so we are forecasting ozone concentrations to quickly rise during the early afternoon/evening hours. As a result, an Ozone High Pollution Advisory is in effect for today and tomorrow, with an Ozone High Pollution Watch in effect for Friday. Learn more about High Pollution Watches/Advisories HERE.

There is a bit of a caveat for Friday, as a weak (and dry) disturbance may move through the state, allowing winds to increase just a bit. Right now, not forecasting these to be strong enough to limit ozone buildup in the Valley, but we will be watching trends closely. Another strong system will dive down into the region from the Pacific Northwest Saturday into Sunday and have strong enough winds to lower ozone back into the Moderate AQI category. By Saturday afternoon, we could see southwest winds in the 15-20 mph range, which might be enough to produce some pockets of blowing dust, so we have raised PM-10 concentrations a bit in the afternoon on Saturday.

The system this weekend will also help to drop temperatures back into the low 90s Sunday into Monday, which is right around average for this time of year.

Finally, the Tussock Fire continues to burn southwest of Crown King. There is a chance smoke will move over the northern portion of the Valley later this afternoon into the evening; however, impacts at the surface are forecast to remain light as smoke will be mostly elevated off the ground. View the Tussock Smoke Forecast HERE.

Have a great Wednesday!

- M. Pace
ADEQ Meteorologist


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