[ADEQ Forecasts] ADEQ AIR QUALITY FORECAST FOR SATURDAY, MARCH 1, 2008

[forecasts@lists.azdeq.gov]

Health message for Friday, Feb 29: Unusually sensitive people should
consider limiting prolonged exertion outdoors.

Health message for Saturday, Mar 1: Unusually sensitive people should
consider limiting prolonged exertion outdoors.

Synopsis and Discussion
Particulates have climbed into the low part of the "Moderate" category
under this ridge of high pressure.  Changes in the weather the next
couple of days may increase those levels initially before dropping them
back into the "Good" range.  The ridge of high pressure will give way to
a trough of low pressure that will push through the western U.S. on
Friday and Saturday.  At the same time, a cutoff area of low pressure
will also move east across northern Mexico.  As the two systems combine
late Saturday into Sunday over Arizona, we expect to see pretty windy
condition develop out of the west.  These winds may kick up additional
dust and particles at times.  By Monday, the trough moves east away from
the region, allowing high pressure to return and winds to decrease.  No
rain is expected, but cooler air will replace Saturday's mid 80s with
mid 70s on Sunday and Monday.  Particulates should begin to clear out of
the Valley on Sunday and Monday for a good start to the week air
quality-wise.  Check back on Sunday for more to your coming workweek's
weather and air quality.  Have a great weekend!  -J.Paul

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

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