Phoenix Forecast

Image of the skyline of downtown phoenix

Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Friday Forecast:

Alert: Ozone Health Watch in effect for Friday
Notice: Brief Late Afternoon - Early Evening Blowing Dust Possible

Ozone

90 AQI
Max 8-hr Avg: 67 ppb

PM10

66 AQI
24-hr Avg: 85 µg/m3

PM2.5

28 AQI
24-hr Avg: 6.7 µg/m3

Saturday Forecast:

Alert: Ozone Health Watch in effect for Saturday

Ozone

93 AQI
Max 8-hr Avg: 68 ppb

PM10

53 AQI
24-hr Avg: 60 µg/m3

PM2.5

26 AQI
24-hr Avg: 6.2 µg/m3

Sunday Forecast:


Ozone

84 AQI
Max 8-hr Avg: 65 ppb

PM10

44 AQI
24-hr Avg: 47 µg/m3

PM2.5

26 AQI
24-hr Avg: 6.2 µg/m3

Monday Forecast:


Ozone

84 AQI
Max 8-hr Avg: 65 ppb

PM10

52 AQI
24-hr Avg: 58 µg/m3

PM2.5

31 AQI
24-hr Avg: 7.5 µg/m3

Tuesday Forecast:

Alert: Ozone High Pollution Advisory possible on Tuesday

Ozone

108 AQI
Max 8-hr Avg: 73 ppb

PM10

55 AQI
24-hr Avg: 63 µg/m3

PM2.5

32 AQI
24-hr Avg: 7.7 µg/m3

Air Quality By Pollutant:

Pollutant
Friday
8/23/2019
Saturday
8/24/2019
Sunday
8/25/2019
Monday
8/26/2019
Tuesday
8/27/2019
O3
90
93
84
84
108
PM10
66
53
44
52
55
PM2.5
28
26
26
31
32
Pollutant
FRI
SAT
SUN
MON
TUE
O3
90
93
84
84
108
PM10
66
53
44
52
55
PM2.5
28
26
26
31
32
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

Thunderstorms got close! Yesterday, a lot of folks probably saw isolated storms south of the city over Pinal County before sunset. If you happened to be up late at night, more storms developed near Queen Creek and southeast of Gilbert around the midnight hour. Local airports, including Phoenix Sky Harbor, did note a wave of gusty winds coming from that direction. The PM10 network lit up as dust crossed the area. The concentrations were not too excessive, but it has resulted in hazy skies this morning.

Other news from yesterday was that faster winds in general from a low pressure trough sagging over Arizona forced ozone to plummet. Highest AQI this time around was 74 (62 parts per billion) at Tonto National Monument. Intensity of vertical winds subside today (the trough is lifting northward out of the area), but there is enough westerly flow to check ozone for most of the upcoming forecast period. Daily values at or near Health Watch criteria (90 to 100 AQI) are still anticipated.

Back to talking thunderstorms and possible blowing dust again. Walking out the door this morning you can quickly tell muggy weather has returned. With that said, we are expecting yet another round of storms getting to the fringe of the Valley later this afternoon and evening. Today and tonight is probably the best opportunity.

Saturday, potential wanes and is all but eliminated by Sunday when dry and warm air overhead caps cloud growth. The demarcation line at that point for storms shifts way southeastward toward the International Border. So, enjoy the storms chances for the moment, but also be careful of the hazards that come with them, including lightning and, of course, blowing dust. I would like to be optimistic about rain. It is just that the coverage and duration of storms that do find their way into the Valley are meager at best, similar to what occurred Thursday night.

Have a great weekend!


- J. Malloy
ADEQ Meteorologist


What Flag Should I Fly?

Sunday: Yellow
Monday: Yellow

What is the Flag Program and how can my school/organization join? | Learn More >