Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Friday Forecast:

Alert: Ozone High Pollution Advisory in effect for Friday

Ozone

101 AQI
Concentration: 71 ppb

PM10

34 AQI
Concentration: 37 µg/m3

PM25

28 AQI
Concentration: 6.8 µg/m3

Saturday Forecast:

Alert: Ozone Health Watch in effect for Saturday

Ozone

97 AQI
Concentration: 69 ppb

PM10

37 AQI
Concentration: 40 µg/m3

PM25

33 AQI
Concentration: 7.8 µg/m3

Sunday Forecast:

Alert: Ozone High Pollution Advisory in effect for Sunday

Ozone

105 AQI
Concentration: 72 ppb

PM10

37 AQI
Concentration: 40 µg/m3

PM25

30 AQI
Concentration: 7.2 µg/m3

Monday Forecast:

Alert: Ozone High Pollution Advisory possible on Monday

Ozone

112 AQI
Concentration: 74 ppb

PM10

38 AQI
Concentration: 41 µg/m3

PM25

35 AQI
Concentration: 8.5 µg/m3

Tuesday Forecast:

Alert: Ozone High Pollution Advisory possible on Tuesday

Ozone

101 AQI
Concentration: 71 ppb

PM10

52 AQI
Concentration: 57 µg/m3

PM25

42 AQI
Concentration: 10.1 µg/m3

Air Quality By Pollutant:

Pollutant
Friday
8/17/2018
Saturday
8/18/2018
Sunday
8/19/2018
Monday
8/20/2018
Tuesday
8/21/2018
O3
101
97
105
112
101
CO
6
7
8
9
8
PM10
34
37
37
38
52
PM2.5
28
33
30
35
42
Pollutant
FRI
SAT
SUN
MON
TUE
O3
101
97
105
112
101
CO
6
7
8
9
8
PM10
34
37
37
38
52
PM2.5
28
33
30
35
42
O3 = Ozone, CO = Carbon Monoxide, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

Did you feel the wave of moisture come crashing through the door when you opened it this morning? Dew points across the Valley are in the upper 60's to low 70's and the moisture content measured by the weather balloon launched in Phoenix this morning was at record levels for the second day in a row. So we should for sure get storms right? Sadly, no... Winds today from the surface up through the atmosphere will be light and out of the west-southwest which will keep almost all storms confined to the higher terrain just north and east of the Phoenix valley. With that said there is still a slight chance of storms in the Valley later this afternoon, but they will be isolated in nature. Any storms that do form around the state today will be capable of producing very heavy rain.

The monsoon ridge that is centered over New Mexico will begin shifting westward today and be centered over the Arizona/California border this weekend. This will result in a much drier westerly flow across the region resulting in monsoon thunderstorm activity taking a break for a few days. By Tuesday into the middle of the week, high pressure will move back over the Four Corners opening the door for moisture and storm chances to move back into the forecast.

As for air quality, the pattern for high ozone levels in the Valley of the Sun will remain in place through the forecast period. As a result, an Ozone High Pollution Advisory is in effect today with an Ozone Health Watch in place tomorrow due to slightly breezier winds expected. With calmer winds and clear skies Sunday, an Ozone High Pollution Advisory will also be in place with additional advisories possible on Monday and Tuesday. Dust (PM-10) is not forecast to be an issue through the weekend, but with storm chances returning to the Valley by Tuesday afternoon, we could see some areas of blowing dust but will expand on that more as we get closer to another potential dust event.

Have a great weekend!

- M. Pace
ADEQ Meteorologist


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