[ADEQ Forecasts] ADEQ Daily Air Quality Forecast for Tuesday, September 15, 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 Monday, September 14: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. 
 
Health message for Tuesday, September 15: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. 


Synopsis and Discussion
Although residual moisture still remains over mainly the eastern half of AZ, the summer monsoon circulation pattern has all but disappeared.  A very high amplitude ridge aloft is over the interior West, and undercutting flow is forecast to deliver and maintain a weak low over Utah by tomorrow afternoon.  Counterclockwise flow around this feature will mean that drier air will continue moving east over AZ.  Thus, a rather benign weather situation for the valley appears to be in store at least thru mid-week.  Drier air, longer nights, and lack of significant cloud cover favor overnight inversion formation, and this in turn may cause modest spikes in morning PM concentrations along the Salt River channel by Wednesday.  Otherwise, breezy afternoons will keep local ozone accumulations in check with highest readings over the far eastern Valley in the low-moderate range of the Air Quality Index.

If you have any questions or comments regarding this forecast please contact:

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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