[ADEQ Forecasts] ADEQ AIR QUALITY FORECAST FOR WEDNESDAY, NOVEMBER 26, 2008

[forecasts@lists.azdeq.gov]

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

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

Health message for Tuesday November 25: Unusually sensitive people
should consider reducing prolonged or heavy exertion. 

Health message for Wednesday November 26: Unusually sensitive people
should consider reducing prolonged or heavy exertion.
 
Synopsis and Discussion
A PM-2.5 HEALTH WATCH REMAINS IN EFFECT TODAY
A dense shield of sub-tropical middle and high etage clouds - with a few
embedded light showers - has moved over the Valley; partial clearing may
take place this afternoon and evening.  These clouds are the precursor
of an upper level low and trough in the southern branch of the
mid-latitude storm track that will continue to slowly approach from the
west the next 36 hours.  A few thunderstorms on Wednesday may cause
brief period of gusty winds and blowing dust at some locations, but
forecast models are still projecting a storm rainfall total of between
1/2" and 1" over the local forecast area by Friday morning. This much
rainfall would go a long way toward stabilizing areas of disturbed
desert soil and would help keep PM-10 (coarse particle) levels much
below their potential for at least a few weeks.  On the other hand,
cooler weather may prompt more people to use their fireplaces, the smoke
from which can cause rapid increases in fine particle (PM-2.5) levels
once a stable weather pattern returns.  At any rate, overall good air
quality is expected by Thursday - a welcome event any time of the year.
-Reith

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