[ADEQ Forecasts] ADEQ AIR QUALITY FORECAST FOR FRIDAY, AUGUST 29, 2008

[forecasts@lists.azdeq.gov]

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

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

Health message for Thursday, August 28: Unusually sensitive people
should consider reducing prolonged or heavy outdoor exertion. 
Health message for Friday, August 29: Unusually sensitive people should
consider reducing prolonged or heavy outdoor exertion. 
Synopsis and Discussion
Lots of sunshine and relatively light winds on Wednesday helped local
ozone formation approach its full potential; the result was that the
maximum 8-hour average and hourly ozone levels were 15 parts per billion
higher than those of Tuesday.  Was on the verge of issuing a Health
Watch for Friday, but it appears that a very active and potentially
severe weather regime is shaping up into the weekend; the collective of
strong winds, rainfall, cooler temperatures, and cloud cover would
greatly inhibit ozone production.  Summer monsoon-variety showers and
thunderstorms today and Friday are likely to be enhanced as early as
Saturday by the approach of a strong upper level trough in the
mid-latitude storm track, preceded by a long fetch of moisture from the
sub-tropics.  By Saturday concentrations of all air pollutants should be
in the good to low-moderate range of the Air Quality Index. NOTE:  The
local peak ozone "season" is nearing an end.  However, the
implementation of the 2008 EPA revised 8-hour ozone standard will
prolong the risk for near-to-unhealthy levels a bit longer.  For the
September months during the period of 1996-2007 there were only four
days that exceeded the old standard (84ppb) - the most recent was on
9/27/1999. Under the new standard (75ppb) the number of exceedances
would rise to 24 - the most recent was on 9/08/2007.-Reith

**********************************************************************
NOTICE: This e-mail (and any attachments) may contain PRIVILEGED OR 
CONFIDENTIAL information and is intended only for the use of the specific 
individual(s) to whom it is addressed.  It may contain information that is 
privileged and confidential under state and federal law.  This information 
may be used or disclosed only in accordance with law, and you may be 
subject to penalties under law for improper use or further disclosure of the 
information in this e-mail and its attachments. If you have received this e-
mail in error, please immediately notify the person named above by reply e-
mail, and then delete the original e-mail.  Thank you.