[ADEQ Forecasts] ADEQ AIR QUALITY FORECAST FOR TUESDAY, MARCH 31, 2009

[forecasts@lists.azdeq.gov]

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

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

Health message for Monday, March 30, 2009: Unusually Sensitive People
should consider limiting prolonged or heavy exertion outdoors.

Health message for Tuesday, March 31, 2009: No health impacts are
expected.
	
Synopsis and Discussion
A frontal boundary is currently making its way across the state this
morning.  Dew point temperatures have plummeted in the western and
northern parts of the state in its wake.  Meanwhile, winds in the
Phoenix metro area have shifted out of the north, indicating that the
frontal boundary is currently making its way through the south-central
part of the state.  The breezy conditions associated with the frontal
boundary may be capable of creating localized areas of blowing dust;
however, widespread elevated PM concentrations are not expected today.
Ozone concentrations throughout the Valley are generally higher than
they were at this time yesterday.  Some ozone monitors are reporting
ozone concentrations that are 10 parts per billion greater than 24 hours
ago.  If the recent ozone pattern associated with frontal passages holds
true, AQI values for ozone may reach into the mid moderate range of the
Air Quality Index (AQI) today, only to fall back to the upper good range
or low moderate range on Tuesday.  Another shortwave trough is expected
to brush by the northern part of the state on Wednesday, contributing to
another breezy day in the Phoenix metro area.  The main focus, however,
will turn to the latter half of the week when a stronger trough may
impact the region.  Check back tomorrow for more air quality updates.
-Paris

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