[ADEQ Forecasts] ADEQ Daily Air Quality Forecast for Wednesday, July 22, 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, July 21: Unusually sensitive people should consider limiting prolonged or heavy exertion outdoors.

Health message for Wednesday, July 22: Unusually sensitive people should consider limiting prolonged or heavy exertion outdoors.


Synopsis and Discussion

*An Ozone Health Watch is in effect for Tuesday, July 21st*

For the fourth day in a row, blowing dust generated from thunderstorm outflow boundaries affected the Phoenix metro area yesterday.  Yesterday's blowing dust event was most prevalent in the West Valley, with the West 43rd monitor nearly exceeding the PM10 National Ambient Air Quality Standard (NAAQS).  Fortunately, the storms producing these high winds also brought some rain to the Valley.  Additional rainfall fell this morning over parts of the southern Valley, with Tempe receiving over an inch of rain according to Maricopa County Flood Control District rain gauges.  Between yesterday's rainfall and this morning's rain, many Valley locations picked up at least some precipitation.  This much needed rain should help suppress dust emissions from any thunderstorm outflow boundaries that affect the Phoenix metro area over the next couple days.  However, localized areas of blowing dust may still occur, especially for those areas that missed out on the recent rain.  Meanwhile, today's Ozone Health Watch will likely not verify due to this mornings rainfall and cloud cover.  Ozone concentrations this morning are lower than those at the same time yesterday.  Subsequently, the Ozone Health Watch will be allowed to expire on Tuesday.  Yesterday's hourly ozone concentrations looked to be on pace to flirt with the Ozone NAAQS, but brisk, westerly winds sent ozone concentrations plummeting in the early afternoon.  Taking into consideration the recent trends in local ozone concentrations, forecasted ozone levels will remain in the mid moderate range of the Air Quality Index (AQI).  Check back tomorrow for the latest air quality updates.


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) 771-2215
ms15@azdeq.gov

 
 

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