[ADEQ Forecasts] ADEQ Daily Air Quality Forecast - Friday, March 04, 2011

Thu Mar 3 10:59:23 MST 2011

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

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

Synopsis and Discussion:
The receipt of ground-level ozone data from additional monitors in the
metro area shows that ozone levels in some locations have already risen
into the low-moderate range of the Air Quality Index.  With low-level
winds conducive to the transport of additional ozone and its precursors
from CA underway, and less cloud cover than expected this afternoon,
local ozone production should be on the increase today.  Fine particle
(PM-2.5) levels also remain elevated and are being contributed to by a
rather stagnant air mass, relatively light winds, and overnight
inversion formation.  A weather change is in the offing for Friday that
may give some relief. Currently a near-zonal (west to east) flow aloft
exists over AZ with a flat upper level ridge overhead.  In the wake of a
passing weak disturbance, an increase in Valley winds is expected by
Friday afternoon with more wind again on Saturday morning.  This should
help to lower both ozone and fine particle levels into the good range of
the Air Quality Index on Saturday.  -Reith   

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Arizona Department of Environmental Quality
Office of Communications
1110 W. Washington St., Phoenix, AZ 85007
(602) 771-2215

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