[ADEQ Forecasts] ADEQ Daily Air Quality Forecast For Friday, November 14, 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 Thursday November 13: Unusually sensitive people
should consider reducing prolonged or heavy exertion.  

Health message for Friday November 14: Unusually sensitive people should
consider reducing prolonged or heavy exertion. 

Synopsis and Discussion
Latest Sky Harbor Airport ACARS sounding data indicates that significant
warming aloft has occurred over the Valley since 24 hours ago and that
as a result the best mixing depth has lowered to near 4300' and that
dispersion today will be in the FAIR range.  Also, a moderate (6-7 deg
C) surface-based radiation inversion that formed overnight reached to
about 1600'.  A profound Valley Brown Cloud of trapped particle
pollution could be seen overhead and is well documented at
http://www.phoenixvis.net/.  Even so, local monitoring sites indicate
that hourly PM-10 (coarse particle) levels were not excessive; at 7:00
a.m. West Forty Third, Coyote Lakes, and Durango all had concentrations
between 185 and 190ug/m3.  The highest PM-2.5 (fine particle) level was
near 33ug/m3.  Higher near-surface moisture levels appear to be playing
a role in the visual aspect of the pollution today.  A strong ridge
aloft located off the California coast will continue to bring a stable
weather regime to the local forecast area.  Fortunately, improved
ventilation provided by increasing gradient winds by Friday afternoon
should keep particle pollution levels below their potential, and an
episode of cleansing gusty easterly winds is expected to occur on
Saturday. 

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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