[ADEQ Forecasts] ADEQ AIR QUALITY FORECAST FOR THURSDAY, JUNE 26, 2008

[forecasts@lists.azdeq.gov]

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

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

Health message for Wednesday, June 25:  Unusually Sensitive People should consider limiting prolonged exertion outdoors.
 
Health message for Thursday, June 26:  Unusually Sensitive People should consider limiting prolonged exertion outdoors.
 
Synopsis and Discussion
Ozone concentrations continue to decline slightly across the forecast area with the southerly flow, pushing ozone and precursors to the north.  Cave Creek had the highest levels on Tuesday and the forecast models suggest that this may be the case through at least Friday.  There has been a slight change in the forecast from the past couple of days.  It was anticipated that the center of the high pressure system to our southeast would move over the Four Corners region by Saturday.  However, it appears that a trough of low pressure just off the coast of southern California will put up one last fight, attempting to move on shore.  Ultimately it will lose that battle, allowing the ridge of high pressure to extend all the way up into western Canada and pushing the low further west.  At that time, easterly winds will kick in across much of Arizona with the center of the high firmly in position near the Four Corners.  Models are suggesting that it could be another week and a half until that happens.  This is good news for air quality as ozone could remain in the low to mid "Moderate" range for a few more days.  Particulates levels have slipped a bit as the air continues to moisten up a bit.  We'll have more for you tomorrow, including a brief look at the coming weekend.  Have a good day!  -J.Paul

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