[ADEQ Forecasts] ADEQ Extends Ozone Health Watch for the Phoenix Metro Area through Friday, July 09, 2010

Thu Jul 8 12:24:05 MST 2010

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Health message for Thursday, July 08: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.   
Health message for Friday, July 09: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.   

Synopsis and Discussion
A ridge aloft building over AZ from the east today will usher in an active summer monsoon episode for most of AZ that should last thru the weekend.  There will be a chance for thunderstorm outflow boundary-generated dense blowing dust (PM-10) - mainly over the east Valley - as early as this evening, becoming likely into the weekend unless/until heavy rainfall occurs.  As for ozone, an east to southeasterly low-level wind regime has become established over the Valley, but speeds this a.m. were much greater than expected. As of 10:00 a.m. hourly ozone concentrations were highest at locations such as Dysart (57 parts per billion), Glendale (52ppb) and North Phoenix (54ppb); these readings were 10-20 ppb higher than 24 hours ago. Today's Ozone Health Watch will remain in effect since winds are advertised to diminish later this afternoon, and by early evening ozone concentrations over much of the central metro area could approach unhealthy levels. Friday is looking like a carbon copy of today with gusty a.m. then decreasing winds, but with an increased probability of cloud cover along with showers and thunderstorms by late afternoon. Since the latter conditions would tend to hinder ozone production, the current Health Watch was extended in lieu of an HPA. -Reith 

If you have any questions or comments regarding this forecast please contact:

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


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