[ADEQ Forecasts] ADEQ Daily Air Quality Forecast For Wednesday, April 1, 2009

[forecasts@lists.azdeq.gov]

For more information, please visit our Web page:
http://www.azdeq.gov/ensemble.pdf

For transportation alternatives:
http://www.valleymetro.org

Health message for Tuesday March 31: No health impacts are expected.

Health message for Wednesday April 01: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. 

Synopsis and Discussion

The majority of local ozone monitoring sites had 8-hour average ozone concentrations that reached the moderate range of the Air Quality Index on Monday - despite westerly wind gusts of 25+ mph during the afternoon hours.  Of special interest was the fact that the highest AQI values were widely dispersed over the Valley - from West Phoenix to North Phoenix to Apache Junction. Winds at and just below the 10K' level were from the west or northwest upstream from the metro area all day Sunday and early Monday, so a minor influx of ozone and its precursors from California appears to have been a contributing factor yet again.  The next in a series of embedded upper level troughs in the large-scale flow pattern will not only bring another round of gusty winds and localized areas of blowing dust to the local forecast area on Wednesday, but low-level winds will again be conducive for additional ozone transport.  Beginning on Wednesday this product will feature data from the entire network of local ozone monitoring sites; as a result of the scenario just described, noticeably higher ozone levels - in the mid-moderate range of the AQI - will likely be reported by Thursday.

If you have any questions or comments regarding this forecast please contact:
The Arizona Department of Environmental Quality
Office of Communications
1110 W Washington St, Phoenix, AZ 85007
(602) 771-4583 
communications@azdeq.gov


 
 

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