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

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

AN OZONE HEALTH WATCH REMAINS IN EFFECT TODAY

Wednesday was another locally "down" day ozone-wise as the anticipated partial easterly wind component failed to hold against a strong upslope westerly component; however, early indications are that ozone concentrations today will be significantly higher.  One reason is that the modest (20-30 mph) outflow boundary from thunderstorm activity north and northeast of the Valley that occurred between 5:00 and 7:00 p.m. had a strong potential to "prime" the local atmosphere with additional ozone precursors in the form of biogenic VOCs.  Another reason is that an 11:00 a.m. AMDAR sounding indicated that a weak northeast to easterly wind regime was over the metro area from the surface to over 20K'.  At 10:00 a.m. all hourly ozone levels but one from the local monitoring network ranged from 51 parts per billion to 61 ppb; at that time North Phoenix displayed an hourly jump of 18ppb and West Phoenix had a 12ppb increase.  Even though debris clouds and gusty outflow winds may impinge upon the Valley again by late afternoon, today's Ozone Health Watch will remain in effect.

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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