[ADEQ Forecasts] ADEQ Daily Air Quality Forecast For Wednesday, April 29, 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, April 28: Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion outdoors. 

Health message for Wednesday, April 29: Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion outdoors. 
 
Synopsis and Discussion

Despite considerable and thick cloud cover during most of the afternoon period, peak Valley ozone levels on Monday were virtually unchanged from those on Sunday.  Winds aloft upstream from the metro area have become southwesterly; this, combined with gusty south to southwesterly surface winds this afternoon, should tend to suppress ozone accumulation.  Highest ozone readings today will likely occur at locations such as Cave Creek, Tonto National Monument, and Humboldt Mountain.  A large upper level trough over the western U.S. is forecast to weaken and then dissipate in place during this forecast period.  An inactive southern branch of the mid-latitude storm track will persist over the local forecast area, but low-level gradients will remain rather weak and afternoon winds will mainly be a function of daytime heating thru at least Friday. Since winds in the 5-10K' layer will become increasingly capable of transporting additional ozone and its precursors from California air sheds to the Phoenix area by Thursday afternoon, an Ozone Health Watch issuance is becoming increasingly likely. 

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
communications@azdeq.gov




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