Phoenix
 
Data and Forecasts courtesy of:
 

 - https://files.airnowtech.org/airnow/today/cur_aqi_phoenix_az.jpg
 
Legend: Tribal Boundaries Tribal Boundaries
The tribal boundaries shown here are provided by the Bureau of Indian Affairs and are intended to be used as a general spatial reference only. They are not a formal determination of tribal boundaries by the EPA.
AQI Forecast - https://files.airnowtech.org/airnow/today/forecast_aqi_20190919_phoenix_az.jpg
 
Legend: Tribal Boundaries Tribal Boundaries
The tribal boundaries shown here are provided by the Bureau of Indian Affairs and are intended to be used as a general spatial reference only. They are not a formal determination of tribal boundaries by the EPA.
AQI Animation - https://files.airnowtech.org/airnow/today/anim_aqi_phoenix_az.gif
 
Legend: Tribal Boundaries Tribal Boundaries
The tribal boundaries shown here are provided by the Bureau of Indian Affairs and are intended to be used as a general spatial reference only. They are not a formal determination of tribal boundaries by the EPA.
 
AQI: Good (0 - 50) AQI: Good (0 - 50)
Air quality is considered satisfactory, and air pollution poses little or no risk.
AQI: Moderate (51 - 100) AQI: Moderate (51 - 100)
Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
AQI: Unhealthy for Sensitive Groups (101 - 150) AQI: Unhealthy for Sensitive Groups (101 - 150)
Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air.
AQI: Unhealthy (151 - 200) AQI: Unhealthy (151 - 200)
Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
 AQI:Very Unhealthy (201 - 300) AQI: Very Unhealthy (201 - 300)
Health alert: everyone may experience more serious health effects.
AQI: Hazardous(301 - 500) AQI: Hazardous (301 - 500)
Health warnings of emergency conditions. The entire population is more likely to be affected.
Action DayAction Day
 
Local Air Quality Resources
Maricopa County Air Quality Department | Maricopa County Dust Forecast | Today's AQI and Forecast (AZ DEQ)
 
State Air Quality Resources
ADEQ Contact Information
ADEQ Regional Haze and Visibility
American Lung Association (ALA) of Arizona
Arizona Department of Environmental Quality Air Quality Division
Clean Air Make More - Maricopa County
Gila River Indian Community DEQ Air Quality Program
 
Data and Forecasts courtesy of:
Current Conditions
Data Not Available
Air Quality Forecast
Today Tomorrow
Air Quality Index (AQI)
46
Good
Health Message: None
Air Quality Index (AQI)
50
Good
Health Message: None
AQI - Pollutant Details
Ozone
46
Good
Particles (PM10)
41
Good
Particles (PM2.5)
26
Good
Ozone
50
Good
Particles (PM10)
40
Good
Particles (PM2.5)
29
Good
Forecast Discussion: [View the ADEQ Hourly Forecast for Phoenix]
Great weather and air quality on Tuesday. The only monitors reaching the Moderate AQI cutoff (and it was right at the cutoff) were Pinnacle Peak and Tonto National Monument for ozone. There is more in the way of fair weather and good air quality expected today! The exception, for the short term, is the West 43rd monitor for PM10 readings. Localized concentrations are spiking in that vicinity early this morning.

Alright, time to step back and take in the weather pattern and what is to come. Right now stronger southwesterly flow is developing over the Desert Southwest region in response to an approaching Pacific trough of low pressure. It doesn't take long to get above the ground (5,000 feet or so) before these winds become apparent. Peak winds for the week enter the Valley Thursday. Gusts 20 to 30 mph are possible. The fetch and orientation of winds crosses over lands in southern Maricopa, western Pinal, and western Pima Counties. Generous rainfall has fallen in that part of the state. Blowing dust should be minimal. For ozone, clearing winds start to increase today and now could last into Friday as the Pacific trough stays close enough in proximity to Arizona to tighten the pressure gradient necessary for faster winds. No rain is expected during this stretch.

Saturday is a hiatus for winds as we find ourselves between major weather systems, but then things may get compelling to start next week. Not only for winds, rain as well. There are a lot of moving parts to an ideal pattern for heavy rain. In this instance, dynamics associated with a potent low pressure trough in the form of atmospheric lift with steeper lapse rates (change in temperature with height) has potential to interact for multiple days with deep tropical moisture moving northward up from the Baja. That is a recipe for excessive rainfall!

There is uncertainty, however, on whether these two features (Pacific trough and tropical moisture) connect to bring a period of significant rain for the mountains and lower deserts of Arizona. The uncertainty (and it is high) arises both from the speed of the Pacific trough into Arizona and the eventual track of multiple tropical systems currently offshore Mexico (e.g., Tropical Storms Kiko, Lorena, and Mario at the moment).

More discussion to come as we get closer to the weekend!


J. Malloy
http://azdeq.gov/phoenix/forecast
Last Update: Wednesday, September 18, 2019, 9:13 AM
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