[ADEQ Forecasts] ADEQ AIR QUALITY FORECAST FOR FRIDAY, MARCH 06, 2009

[forecasts@lists.azdeq.gov]

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

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

Health message for Thursday March 05: Unusually sensitive people should
consider reducing prolonged or heavy exertion.  

Health message for Friday March 06: Unusually sensitive people should
consider reducing prolonged or heavy exertion. 

Synopsis and Discussion
It was still rather stagnant out there this morning, but the highest
hourly PM-10 (coarse particle) level was 130.8ug/m3 at the Higley
monitoring site at 7:00 a.m.  A vigorous but dry upper level trough in
the mid-latitude storm track, along with an associated surface cold
front, will arrive over the local forecast area on Friday.  Extensive
cloud cover should help keep winds and blowing dust below their
potential, but the frontal passage should result in breezy conditions as
well as the potential for areas of locally-produced and transported
dust.  Under full sunshine, local ozone levels at some downwind
monitoring sites may experience a spike on Saturday since the low-level
flow will be capable of transporting additional precursors from
California.  Even so, relatively benign but cool weather conditions will
follow during the weekend with overall good air quality expected.
-Reith  

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