[ADEQ Forecasts] ADEQ AIR QUALITY FORECAST FOR TUESDAY, MARCH 24, 2009

[forecasts@lists.azdeq.gov]

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

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

Health message for Monday March 23: Unusually sensitive people should
consider reducing prolonged or heavy exertion outdoors. 

Health message for Tuesday March 24: Unusually sensitive people should
consider reducing prolonged or heavy exertion outdoors. 

Synopsis and Discussion
In the wake of Sunday's high wind event there are lots of suspended dust
(PM-10) particles over the Valley this a.m.  Most local monitoring sites
have recorded hourly coarse particle concentrations in excess of
100ug/m3 from midnight thru the 8:00 a.m. period.  As the mixing depth
increases and higher winds aloft become entrained, dispersion should
improve this situation markedly by late afternoon.  The upper level
trough and surface cold frontal passage responsible for the winds also
delivered a modest influx of California ozone and its precursors; at
every metro area monitoring site peak hourly ozone concentrations for
Sunday occurred between 9:00 and 11:00 p.m.  The western flank of the
aforementioned trough will remain over the local forecast area into
midweek and may even deliver another strong wind event on Thursday.  In
the meantime, much lighter winds and only minor warming aloft should
help keep coarse particle levels below critical levels on Tuesday and
Wednesday and ozone levels - after peaking today - should remain in the
low-moderate range of the Air Quality Index thru this forecast period.
-Reith  

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