[ADEQ Forecasts] ADEQ Daily Air Quality Forecast - Thursday, September 29, 2011

Wed Sep 28 12:59:38 MST 2011

Health message for Wednesday September 28:  Unusually sensitive people
should consider reducing prolonged or heavy exertion outdoors.

Health message for Thursday September 29:  Unusually sensitive people
should consider reducing prolonged or heavy exertion outdoors. 

Synopsis and Discussion
OZONE:  A modest increase (nine parts per billion) in local 8-hour ozone
levels occurred on Tuesday and another jump is expected today -
especially at the higher terrain locations such as Blue Point and Rio
Verde.  As of 11:00 a.m. hourly readings were running up to 15 parts per
billion higher than 24 hours ago.  Still in all, at this time it appears
that the 2011 ozone forecast season (April 01 - September 30) will end
on a rather quiet note.  
PARTICLES:   An outflow boundary generated by thunderstorms over Pima
County moved another wall of dust over much of the Phoenix metro area
Tuesday evening.  The highest instantaneous PM-10 concentration was
1,207.8ug/m3 at the West Chandler monitoring site at 6:44 p.m.
Lingering suspended and trapped dust resulted in some high readings
today that since 5:00 a.m. reached 297.4ug/m3 at Buckeye.  Sufficient
moisture from Mexico remains over southeast AZ where another round of
thunderstorms is expected.  Outflow boundary winds from this activity
may again move a dust cloud toward mainly the southeast Valley late this
afternoon or evening.  After a somewhat quieter day on Thursday, an
increase in thunderstorms is possible beginning Friday depending on the
amount of moisture that reaches the Valley from the remains of Hurricane
soon-to-be Tropical Storm Hilary.  Otherwise, westerly breezes thru
Thursday will give way to southeasterly winds on Friday.  

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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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