[ADEQ Forecasts] ADEQ Issues an Ozone Health Watch for the Phoenix Metro Area Saturday and Sunday, April 17 - 18, 2010

Fri Apr 16 11:33:16 MST 2010

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Health message for Friday, April 16: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. 

Health message for Saturday, April 17: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. 

Synopsis and Discussion

High pressure will push afternoon desert temperatures above 90°F on Saturday and Sunday with a few hotter spots pushing into the mid to upper 90s.  A weak disturbance will slide east along the Arizona/Mexico border Saturday followed by another on Monday.  The one on Monday will drop temperatures into the mid 80s and possibly send some high clouds across Arizona as it moves through.  Neither will bring rain, but both will have an affect on air quality here in the Valley.

Mostly light winds out of the east will continue to lock ozone and precursors in the Valley.  Ample sunshine and heat will bake those precursors, forming ozone.  You can't see it, you can't taste, you can't smell it, but you may feel its affect on your breathing if you're outdoors for prolonged periods of time during the afternoons this weekend.  

Concentrations reached the upper part of the "Moderate" range at several local monitors on Thursday.  High clouds have limited the production for today, but a return to sunny skies Saturday and Sunday mean concentrations may once again approach the health standard.  As a result, an Ozone Health Watch for Saturday and Sunday for the Phoenix metropolitan area has been issued.  The main areas that will be affected will be the central part of Phoenix, north towards Cave Creek and Carefree, as well as the northwest part of the Valley including Glendale, Peoria, Surprise and Sun City.  A return to a more southwesterly flow on Monday will push the plume and additional precursors to the northeast.  Residents are urged to take necessary precautions this weekend.  Health affects and reduction tips can be viewed below as well as at AirNow.gov.

Check back on Sunday for the latest information.  Until then, have a great weekend!  -J.Paul

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


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