[ADEQ Forecasts] ADEQ Daily Air Quality Forecast For Thursday, September 17, 2009

[forecasts@lists.azdeq.gov]

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

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http://www.valleymetro.org


Health message for Wednesday, September 16: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. 
 
Health message for Thursday, September 17: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. 


Synopsis and Discussion
Weak overnight inversion formation again contributed to some elevated hourly PM-10 (coarse particle) readings this a.m. with the South Phoenix, Durango, and West Forty Third monitoring sites yielding peak concentrations from 124.0 to 171.4ug/m3 between 6:00 and 7:00 a.m.  Meanwhile, local ozone levels remained extremely low for the second consecutive day.  An approaching weather feature may bring modestly higher concentrations of both pollutants beginning on Thursday, however.  The track of a weak upper level low over eastern AZ will bring a chance for thunderstorms to the higher terrain on the Valley periphery today thru Friday.  As a result, there will be the potential for gusty down-slope outflow winds at times - mainly over the east metro area - and the possibility of areas of blowing dust.  The lingering characteristics of said outflow boundaries - along with a weak to easterly low-level wind regime - may also increase both ozone production and accumulation.  Even so, highest levels of both pollutants are not expected to reach above the mid-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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