[ADEQ Forecasts] ADEQ Daily Air Quality Forecast - April 30, 2010

Fri Apr 30 13:14:17 MST 2010

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Health message for Friday, April 30: Unusually sensitive people should
consider limiting prolonged or heavy exertion outdoors.

Health message for Saturday, May 1: Unusually sensitive people should
consider limiting prolonged or heavy exertion outdoors. 

Synopsis and Discussion
Strong gusty winds on Thursday associated with a large trough of low
pressure over the western U.S. produced some pockets of blowing dust as
well as a few spotty showers across the Valley.  The highest PM10
concentrations reach the mid "Moderate" range at the West 43rd Ave.
monitor.  Typically these strong winds are too much of ozone to handle,
but there must have been just enough precursors and transported ozone
from the west as three local monitors (North Phoenix, Queen Valley, and
Tonto National Monument) climbed into the lower "Moderate" range.  

The winds have died down and skies are clear to start the day on Friday.
Visibility has improved significantly compared to Thursday.  The trough
will continue to linger across the region while most of its energy pulls
east.  This will keep our afternoon desert temperatures in the upper 70s
to lower 80s through Sunday.  High pressure will begin to build strong
over the southwestern U.S. Monday through next week.  We'll see highs in
Phoenix flirt with triple digits on Wednesday and Thursday.

What does this all mean for the weekend's air quality?  Lighter winds
will keep particulates down, so we expect PM10 levels to remain in the
"Good" range through early next week.  Ozone concentrations may peak
into the lower "Moderate" range at a few spots this weekend.  Highest
levels will likely be in the central, north and east part of the Valley.
Otherwise, it looks like it will be a great couple of days for outdoor

Check back on Sunday for the latest.  Until then, enjoy your weekend!  
If you have any questions or comments regarding this forecast please
Arizona Department of Environmental Quality
Office of Communications
1110 W. Washington St., Phoenix, AZ 85007
(602) 771-2215

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