[ADEQ Forecasts] ADEQ AIR QUALITY FORECAST FOR WEDNESDAY, MARCH 04, 2009

[forecasts@lists.azdeq.gov]

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

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

Health message for Tuesday March 03: Unusually sensitive people should
consider reducing prolonged or heavy exertion.  

Health message for Wednesday March 04: Unusually sensitive people should
consider reducing prolonged or heavy exertion. 

Synopsis and Discussion
Per ACARS sounding data another moderate (6-7 deg C) surface-based
Valley inversion that extends to over 1800' managed to form overnight.
As of noon the inversion had not yet broken with thick cloud cover
inhibiting vertical mixing as well.  Hourly PM-10 (coarse particle)
levels were up again this a.m.; readings reached 133.5ug/m3 at the
Durango monitoring site, 134.5ug/m3 at West Forty Third, and 176.0ug/m3
at Buckeye.  Interesting to note that with the return of afternoon
westerly winds, highest recorded ozone levels at West Phoenix and North
Phoenix during the weekend shifted back to the Apache Junction site on
Monday.  The local forecast area will remain situated between a deep
upper trough to the west and a strong ridge to the east.  The trough
will draw closer with time, however, with cooler temperatures and
stronger winds the main impacts.  PM-10 concentrations are expected to
peak on Wednesday due to the on-two punch of stagnation in the morning
and light dust due to gusty winds in the afternoon. As the upper trough
position becomes established over the western U.S., much cooler and
perhaps showery conditions are advertised for the weekend.  Until then,
no significant local air quality problems are anticipated. Reith  

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