[ADEQ Forecasts] ADEQ AIR QUALITY FORECAST FOR FRIDAY, OCTOBER 24, 2008

[forecasts@lists.azdeq.gov]

http://www.azdeq.gov/ensemble.pdf

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

Health message for Thursday, October 23: Unusually sensitive people
should consider reducing prolonged or heavy exertion.  

Health message for Friday, October 24: Unusually sensitive people should
consider reducing prolonged or heavy exertion. 

Synopsis and Discussion
Concentrated winds over the far northwest Valley on Wednesday morning -
associated with a dry frontal passage - managed to produce a small-scale
blowing dust event that resulted in a PM-10 (coarse particle) exceedance
at the Coyote Lakes monitoring site; all other metro sites had PM-10
24-hour average concentrations that were below the mid-moderate range of
the Air Quality Index.  As evidenced by the rather dense Valley Brown
Cloud of trapped particle pollution over the forecast area this morning,
the frontal passage did little to ameliorate the stable and increasingly
stagnant air mass overhead.  A strong ridge aloft in the mid-latitude
storm track will dominate the local weather thru the upcoming weekend.
Relatively light winds, strong overnight inversion formation, and
warming aloft will contribute to elevated PM-10 & PM-2.5 levels at some
locations on Friday.  Less activity/fewer fugitive dust emissions should
mean lower PM-10 concentrations on Saturday & Sunday. -Reith   

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