[ADEQ Forecasts] ADEQ Daily Air Quality Forecast - Friday, December 04, 2009
Thu Dec 3 12:21:23 MST 2009
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Health message for Thursday, December 3: Unusually sensitive people should consider limiting prolonged exertion outdoors.
Health message for Friday, December 4: Unusually sensitive people should consider limiting prolonged exertion outdoors.
Synopsis and Discussion
Winter coats should be coming out tonight across the Valley as a cold pocket of air will dive south into Arizona. Afternoon highs will struggle to reach the lower 60s on Friday while overnight lows will be in the 30s (approaching the freezing mark in some of the outer-lying desert areas). No rain is expected with this system, but our eyes are being drawn to a much bigger trough of low pressure developing over the Pacific Northwest. This system is slated to push into Arizona late Monday into early Tuesday. Subtropical moisture will get pulled into the region, producing clouds and potentially ground-soaking, Valley-wide rain. The timing has been a bit of an issue with each model run slightly holding it back. We'll have a better idea of timing tomorrow and definitely by Sunday.
The Phoenix forecast area's air quality was once again fairly good for this time of year with only two PM-10 sites (Durango and West 43rd) reaching the lower "Moderate" range. This evening's breezy conditions may kick up some additional dust, but nothing too significant. The winds should also help disperse some of the residential wood-burning smoke. As a result, continued good air quality is expected on Friday with PM-10 concentrations dropping off during the afternoon hours. As mentioned above, all sights are set on next week's potential rain event as it could have lasting effects on PM-10 concentrations, keeping them well in the "Good" range for an extended period of time.
Check back tomorrow for a closer look at your weekend's weather and air quality. Until then, have a good day! -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
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