[ADEQ Forecasts] ADEQ Extends Ozone Health Watch for the Phoenix Metro Area through Friday, September 3, 2010

Thu Sep 2 12:43:07 MST 2010

Health message for Thursday, September 02: Unusually sensitive people
should consider reducing prolonged or heavy exertion. 


Health message for Friday, September 03: Unusually sensitive people
should consider reducing prolonged or heavy exertion. 



Synopsis and Discussion

Since Sunday highest local 8-hour average ozone levels have risen by 20
parts per billion and peak hourly concentrations have increased by 28
ppb.  During the same period afternoon high temperatures have warmed by
3-5 deg F, cloud cover has become nearly absent, and afternoon winds
have decreased from gusting to 30 mph to mostly <15 mph. Since
relatively light winds are forecast to continue thru Friday, and
afternoon highs are expected to top 110 deg F by then, today's Ozone
Health Watch will remain in effect and has been extended thru Friday.
As of 10:00 a.m. today hourly ozone concentrations at the central metro
monitoring sites - those most at risk for high ozone readings the next
few days - were running up to 11 ppb higher than 24 hours ago.  Although
a ridge aloft is currently building over the state from the west and
south, significant monsoon moisture will not return to the Phoenix metro
area for the foreseeable future.  The current light wind regime will
give way to breezy east to southeasterly winds on Saturday morning and
increasing southwesterly winds on Sunday afternoon as another upper
level trough in the mid-latitude storm track approaches from the west.
As a result, local ozone readings will likely drop into good range of
the Air Quality Index this weekend.-Reith



For more information, please visit our Web page:



For transportation alternatives:

http://www.valleymetro.org <http://www.valleymetro.org/> 



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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