[ADEQ Forecasts] ADEQ Issues Air Pollution Health Watch for Sat-Sun., May 10-11

Fri May 9 12:08:35 MST 2008


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Health message for Friday, May 9:  Unusually sensitive people should
consider reducing prolonged or heavy exertion outdoors. 
Health message for Saturday, May 10:  Unusually sensitive people should
consider reducing prolonged or heavy exertion outdoors. 
Synopsis and Discussion
10-11, 2008*
Here we go again... Another trough of low pressure is setting up over
the western U.S. creating a southwesterly flow over Arizona.  Looking to
the southwest, we see clouds at 15-20,000 feet streaming towards the
Valley on Friday.  It's very dry below that, so no rain is expected.
These clouds should clear by about 1PM.  Unfortunately, Yuma recorded
high ozone on Thursday, exceeding the 8-hr standard with a 76ppb (101
AQI).  Typically when this happens, Phoenix will see elevated readings
24 hours later, which puts us at today.  Hopefully the cloud cover is
enough to keep us from exceeding on Friday.  The trough will weaken a
bit on Saturday and retreat north.  This means there will be lull in
transport of ozone and precursor into the Valley, but it also means that
there won't be very good dispersion of the existing pollution, either.
As a result, we are issuing an Ozone Health Watch for both Saturday and
Sunday, May 10-11.  The trough strengthens late Monday, increasing winds
out of the southwest here in the deserts once again.  By Tuesday
afternoon the trough pushes through Arizona and moves into New Mexico.
Northerly winds will commence, shutting off additional ozone import from
southern California, and clearing the Valley's air.  Check back on
Sunday for a look at your Mother's Day air quality as well as the coming
workweek's forecast.  Have a great weekend!  -J.Paul

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