[ADEQ Forecasts] ADEQ Issues Air Pollution Health Watch For Tuesday, November 11, 2008

[forecasts@lists.azdeq.gov]

For more information, please visit our Web page:
http://www.azdeq.gov/ensemble.pdf


For transportation alternatives:
http://www.valleymetro.org


Health message for Monday November 10: Unusually sensitive people should consider reducing prolonged or heavy exertion.  

Health message for Tuesday November 11: Unusually sensitive people should consider reducing prolonged or heavy exertion. 

Synopsis and Discussion
A PM-10 HEALTH WATCH HAS BEEN ISSUED FOR TUESDAY NOVEMBER 11
In the wake of Sunday's trough and frontal passage - and the associated strong wind and blowing dust event - a strong ridge aloft is poised to begin building over AZ from the west by mid-week. Lingering suspended dust particles contributed to elevated hourly PM-10 readings this morning that included 153.0ug/m3 at the Higley monitoring site, 142.5ug/m3 at West Forty Third, and 133.7ug/m3 at Durango; as of 10:00 a.m. some sites still had levels in excess of 100ug/m3.  Warming aloft over the Valley will begin on Tuesday and is advertised to attain 9 deg F in the 5-10K' layer by the afternoon.  Meanwhile, winds are expected to be relatively light and the mixing depth may shrink to as low as 5K'.  With some elevated PM-10 concentration carry-over from today and a steep inversion Tuesday morning possible, coarse particle levels may approach unhealthy levels on Tuesday despite the reduction in holiday emissions.  For these reasons, a PM-10 Health Watch has been issued for tomorrow.  As the leading edge of the ridge aloft begins to build overhead on Wednesday, increasing gradient winds are anticipated to result in an improvement in ventilation of the Valley air mass and somewhat lower particle pollutant levels. 
 
If you have any questions or comments regarding this forecast please contact:
The Arizona Department of Environmental Quality
Office of Communications
1110 W Washington St, Phoenix, AZ 85007
(602) 771-4583 
communications@azdeq.gov

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