Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Friday Forecast:


Ozone

42 AQI
Max 8-hr Avg: 45 ppb

PM10

38 AQI
24-hr Avg: 41 µg/m3

PM2.5

45 AQI
24-hr Avg: 10.7 µg/m3

Saturday Forecast:


Ozone

37 AQI
Max 8-hr Avg: 40 ppb

PM10

15 AQI
24-hr Avg: 16 µg/m3

PM2.5

30 AQI
24-hr Avg: 7.2 µg/m3

Sunday Forecast:


Ozone

39 AQI
Max 8-hr Avg: 42 ppb

PM10

19 AQI
24-hr Avg: 20 µg/m3

PM2.5

42 AQI
24-hr Avg: 10.0 µg/m3

Monday Forecast:


Ozone

41 AQI
Max 8-hr Avg: 44 ppb

PM10

27 AQI
24-hr Avg: 29 µg/m3

PM2.5

45 AQI
24-hr Avg: 10.8 µg/m3

Tuesday Forecast:


Ozone

40 AQI
Max 8-hr Avg: 43 ppb

PM10

35 AQI
24-hr Avg: 38 µg/m3

PM2.5

47 AQI
24-hr Avg: 11.3 µg/m3

Air Quality By Pollutant:

Pollutant
Friday
2/21/2020
Saturday
2/22/2020
Sunday
2/23/2020
Monday
2/24/2020
Tuesday
2/25/2020
O3
42
37
39
41
40
PM10
38
15
19
27
35
PM2.5
45
30
42
45
47
Pollutant
FRI
SAT
SUN
MON
TUE
O3
42
37
39
41
40
PM10
38
15
19
27
35
PM2.5
45
30
42
45
47
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

Clouds are already on the increase, and big weather changes are coming into the forecast starting late tonight. Water vapor satellite this morning paints a great picture as to the current set-up. An area of low pressure is sitting about 450 miles off the coast of Southern California. At the same time, a larger area of subtropical moisture is streaming into Arizona from the southwest. As the low moves eastward, it will interact with the subtropical moisture and lead to a very good chance of rain across the entire state. Here in Phoenix, rain chances are expected to rise later tonight and especially Saturday morning. Rain could be heavy at times, especially with any thunderstorms that develop Saturday afternoon. By late Saturday evening, all rain chances should come to an end.

We are currently forecasting rain totals to be in the 0.50-0.75 inch range within the Valley, with higher totals in the 1-1.5 inch range for locations just north and east of the Valley. The National Weather Service has already issued a Flash Flood Watch in effect for the Phoenix valley Saturday morning through evening. Watch for running washes and remember, turn around, don't drown!

This system will also bring gusty southwest winds of 15-25mph Saturday afternoon. Not concerned about dust with these winds given the fact rain will be falling at the same time.

The storm system will quickly shift east of the region Sunday, with clearing skies and lighter winds expected as high pressure builds back into the area. A weak and dry cold front is expected to sweep through the state Monday, which will help to increase north-northeast winds Monday into Tuesday.

As for air quality, with easterly breezes today and rain tomorrow, forecasting ozone, PM10, and PM2.5 to all be in the Good AQI category through the weekend. A slow rise in PM10 and PM2.5 is expected heading into the first part of next week.

Have a great weekend, and enjoy the change in weather!

- M. Pace
ADEQ Meteorologist


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