[ADEQ Forecasts] ADEQ Extends Air Pollution Health Watch through Tues., July 1

[forecasts@lists.azdeq.gov]

http://www.azdeq.gov/ensemble.pdf

For transportation alternatives:
http://www.valleymetro.org 

Health message for Monday, June 30:   Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion. 

Health message for Tuesday, July 01:  Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion. 
Synopsis and Discussion

TODAY'S OZONE HEALTH WATCH HAS BEEN EXTENDED THRU TUESDAY JULY 01
Near-to-unhealthy ozone levels are a possibility over much of the metro area today.  At the noon hour under sunny skies local temperatures had already reached 105 deg F in some spots and as easterly surface winds slowly decrease, ozone production and accumulation will both be above average.  It remains to be seen if yesterday evening's thunderstorm outflow from the forested areas east and northeast of the metro area will positively impact ozone chemistry, but on many occasions in the past such has been the case. As of 10:00 a.m. hourly readings were as much as 15 parts per billion higher than 24 hours ago; thus, today's Ozone Health Watch will remain in effect and has been extended thru Tuesday.  The synoptic weather pattern is now decidedly summer monsoon-like with an upper level high situated in proximity to the Four Corners and east to southeasterly flow around its circulation importing higher moisture from New and Old Mexico.  Unfortunately, humidity levels are still on the low side over much of Arizona, and thunderstorms are more apt to produce more wind and dust than rainfall over the deserts - including Phoenix.  As a result, brief periods of unhealthy PM-10 (coarse particles) levels are possible in some areas.  -Reith    

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