[ADEQ Forecasts] ADEQ Daily Air Quality Forecast - Wednesday, April 14, 2010

Tue Apr 13 11:21:23 MST 2010

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Health message for Tuesday, April 13: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.  

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

Synopsis and Discussion
Afternoon winds associated with Monday's frontal passage and upper level trough arrival did generate some local blowing dust as forecast.  The West Forty Third PM-10 (coarse particle) monitoring site recorded a peak hourly concentration of 456.3ug/m3 at 3:00 p.m.  The aforementioned trough will move northeast later today and in its wake strong warming aloft (10 to 22 deg F in the 5-10K' layer) and at the surface (12 deg F) is advertised to occur by Thursday afternoon.  The former will make for rather stagnant mornings and increase the potential for high hourly PM-10 concentrations near the Salt River channel, and the latter - in concert with much lighter winds and full sunshine - will be highly conducive to increased ozone formation. This process has already begun; as of 9:00 a.m. hourly ozone concentrations around the metro area ranged from 5 to 15 parts per billion higher than the same time on Monday and a handful of locations were at the 50ppb level. Prevailing winds should keep highest ozone levels confined mainly to the north and northeast Valley. -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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