[ADEQ Forecasts] ADEQ AIR QUALITY FORECAST FOR TUESDAY, JUNE 10, 2008

[forecasts@lists.azdeq.gov]

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

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

Health message for Monday, June 09:  Unusually sensitive people should
consider reducing prolonged or heavy outdoor exertion. 

Health message for Tuesday, June 10:  Unusually sensitive people should
consider reducing prolonged or heavy outdoor exertion. 
Synopsis and Discussion
AN OZONE HEALTH WATCH REMAINS IN EFFECT FOR TODAY MONDAY JUNE 09
Thru 10:00 a.m. Monday morning hourly ozone levels at Valley monitoring
sites were at or above those of 24 hours ago and ranged from 44 parts
per billion at West Chandler to 60 ppb at North Phoenix.  Low-level
pressure gradients will be nil over the metro area so afternoon winds
will solely be a function of daytime heating and upslope flow.  Under
sunny skies and temperatures near 105 deg F ozone plume formation will
be very efficient with above-average accumulation.  As southwesterly
breezes increase, the plume should drift slowly to the northeast and
east; thus, that quadrant of the Valley will have the highest and
lengthiest risk for unhealthy ozone levels by the late afternoon/early
evening. The last in the months-long series of upper level troughs will
approach the area on Tuesday with significantly higher winds that
afternoon and even stronger winds on Wednesday, along with the potential
for blowing dust and a concurrent spike in coarse particle (PM-10)
levels.  Wind trajectories will be capable of transporting additional
ozone and its precursors from California as early as Tuesday afternoon,
so both PM-10 and Ozone Health Watches may be necessary for Wednesday.
-Reith    

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