[ADEQ Forecasts] ADEQ Issues an Ozone Health Watch for the Phoenix Metro Area for Wednesday, May 26, 2010

Wed May 26 12:21:57 MST 2010

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Health message for Wednesday, May 26 Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.

Health message for Thursday, May 27: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. 

Synopsis and Discussion
Peak Valley ozone levels rose significantly between Monday and Tuesday and since it now appears that they may approach unhealthy levels later today, an Ozone Health Watch has been issued for late this afternoon and evening.  At 10:00 hourly ozone concentrations were running as much as 17 parts per billion higher than the same time yesterday; the average of 13 sites was a +9.4 ppb increase over Tuesday.  Little if any cloud cover and afternoon high temperatures in the middle 90's will be conducive to the continued efficiency of ozone production.  Also, a recent Sky harbor ACARS sounding light winds overhead up to the 3600' level and <15 mph to the 7400' level.  This means that ozone accumulation will also be above average. Once upslope south to southwesterly winds begin the local ozone plume will tend to drift toward over the northeast and east Valley where ozone concentrations at three sites (North Phoenix, Fountain Hills & Rio Verde) were already at the 64+ppb level.  Earlier and stronger winds are expected on Thursday when a drop in ozone readings is expected. -Reith

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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