[ADEQ Forecasts] ADEQ Daily Air Quality Forecast - Tuesday, September 28, 2010

[forecasts@lists.azdeq.gov]

Health message for Monday, September 27: Unusually sensitive people
should consider reducing prolonged or heavy exertion outdoors. 
  
Health message for Tuesday, September 28: Unusually sensitive people
should consider reducing prolonged or heavy exertion outdoors. 
 

Synopsis and Discussion
A very large and strong upper level ridge will be over the western U.S.
including AZ thru this forecast period. Meanwhile, a weak westward
moving disturbance over Sonora Mexico will continue to spread some
cloudiness over mainly southern AZ the next few days.  A relatively
light to easterly wind regime that is expected to occur over the Valley
from Tuesday thru Thursday will combine with mostly sunny skies and
near-record afternoon heat to produce a situation conducive to higher
ozone levels.  Even so, increasingly shorter days and lower sun angles
should make it difficult for highest concentrations to rise much above
the mid-moderate range of the Air Quality Index. The same weather
conditions will also result in a rather stagnant air mass over the metro
area at times with overnight inversion formation likely.  This in turn
will promote some high hourly PM-10 readings - mainly adjacent to the
Salt River channel - during the morning and evening hours; however,
24-hour average concentrations will be well below critical levels.
-Reith 


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

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


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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