Tucson Forecast

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Air Quality Hourly Forecast | Tucson

Click on each day to view forecast.

Monday Forecast:


Ozone

44 AQI
Max 8-hr Avg: 47 ppb

PM10

33 AQI
24-hr Avg: 36 µg/m3

Tuesday Forecast:


Ozone

36 AQI
Max 8-hr Avg: 39 ppb

PM10

30 AQI
24-hr Avg: 32 µg/m3

Wednesday Forecast:


Ozone

32 AQI
Max 8-hr Avg: 35 ppb

PM10

17 AQI
24-hr Avg: 18 µg/m3

Thursday Forecast:


Ozone

31 AQI
Max 8-hr Avg: 34 ppb

PM10

16 AQI
24-hr Avg: 17 µg/m3

Friday Forecast:


Ozone

34 AQI
Max 8-hr Avg: 37 ppb

PM10

21 AQI
24-hr Avg: 23 µg/m3

Air Quality By Pollutant:

Pollutant
Monday
11/18/2019
Tuesday
11/19/2019
Wednesday
11/20/2019
Thursday
11/21/2019
Friday
11/22/2019
O3
44
36
32
31
34
PM10
33
30
17
16
21
Pollutant
MON
TUE
WED
THU
FRI
O3
44
36
32
31
34
PM10
33
30
17
16
21
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

The stage is set for some significant weather changes moving into the forecast starting tomorrow. But first, we have to talk about today. High pressure this morning is elongated from about Las Vegas back through Central California. The area of high pressure will weaken and shift southeast through Arizona today, which will result in weaker winds and continued warm temperatures.

Now it's time to look at the more exciting weather starting tomorrow through the end of the week. Water vapor really shows the set-up well. A well-defined cutoff low-pressure system is sitting off the coast of Baja. This system was able to pull in a decent amount of moisture from former Tropical Storm Raymond. At the same time, a trough of low pressure is developing off the coast of the Pacific Northwest. These two storm systems will come together over Arizona late Tuesday through Thursday, resulting in a near 100 percent chance of rain.

Rain chances are forecast to increase Tuesday afternoon/evening as the cutoff low moves northeast into the state. This first system will import plenty of subtropical moisture into the region leading to the chance for heavy rain across the region. As this system slowly leaves the region, the trough of low pressure noted above will dive into the state from the northwest. The energy of this storm will be able to interact with the subtropical moisture already in place, leading to another excellent chance of rain Wednesday afternoon into Thursday. Rain chances are forecast to come to an end late Thursday night.

Overall, rain totals in Tucson could range from 1-2 inches. Temperatures will also see a significant drop, with forecast high temperatures on Thursday and Friday in the low 60s!

As for air quality, with the rain, PM-10 is expected to drop late Tuesday through the rest of the forecast period. Ozone, after today, will primarily be at background levels in the Good AQI category.

Have a great Monday, and hope you are looking forward to the rain as much as we are!

- M. Pace
ADEQ Meteorologist


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Monday: Green
Tuesday: Green

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