[ADEQ Forecasts] ADEQ Daily Air Quality Forecast - Thursday, April 15, 2010

Wed Apr 14 11:31:12 MST 2010

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Health message for Wednesday, April 14: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.  

Health message for Thursday, April 15: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.  

Synopsis and Discussion
Local ozone concentrations rebounded sharply on Tuesday with the highest 8-hour average up 11 parts per billion from Monday's readings; the maximum hourly concentration was 15 ppb higher.  There appears to be an above-average potential for additional increases in local ozone production and accumulation the next two days.  Little if any cloud cover is expected and afternoon high temperatures should hit the 90-degree mark on Thursday.  As of 9:00 a.m. the highest hourly ozone concentration was 57 ppb at Cave Creek and several sites recorded 15-20 ppb jumps between 8:00 and 9:00 a.m.  Morning ACARS sounding data from Sky Harbor Airport show light winds below the 5K' level and south to southwesterly winds thru the remainder of the mixed layer.  This will allow ozone to congregate over the central metro area today before being moved to the north and northeast during the late afternoon. As a result, the latter portions of the Valley will the most susceptible to elevated ozone levels today and again on Thursday since a similar situation is likely with even lighter winds aloft.  Winds and cloud cover associated with an approaching trough will hamper ozone production on Friday. -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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