[ADEQ Forecasts] ADEQ AIR QUALITY FORECAST FOR THURSDAY, FEBRUARY 28, 2008

[forecasts@lists.azdeq.gov]

Health message for Wednesday, Feb 27: Unusually sensitive people should
consider reducing prolonged or heavy exertion.

Health message for Thursday, Feb 28: Unusually sensitive people should
consider reducing prolonged or heavy exertion. 

Synopsis and Discussion
A high-amplitude ridge aloft has begun to build over Arizona; its axis
is just to the west of the state and a weak disturbance will move thru
it on Thursday.  Low-level gradients are much weaker today than on
Tuesday and per ACARS soundings winds aloft had already dropped off to
mostly <15 mph before the noon hour.  Warm air aloft and relatively
light winds will tend to result in less than favorable dispersion the
next few days and be accompanied by a modest but steady increase in
trapped particle pollutant concentrations. At this time pollutant levels
are not expected reach beyond the mid-moderate range of the Air Quality
Index thru this forecast period.  -Reith

http://www.azdeq.gov/environ/air/ozone/ensemble.pdf

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