[ADEQ Forecasts] ADEQ Issues High Pollution Advisory For Tuesday, May 20, 2008

[forecasts@lists.azdeq.gov]

For more information, please visit our Web page:

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


Health message for Monday, May 19:  Unusually sensitive people should
consider reducing prolonged or heavy outdoor exertion.   

Health message for Tuesday, May 20:  Active children and adults, and
people with lung disease such as asthma, should reduce prolonged or
heavy outdoor exertion.  

Synopsis and Discussion

AN OZONE HEALTH WATCH REMAINS IN EFFECT TODAY  
AN OZONE HIGH POLLUTION ADVISORY HAS BEEN ISSUED FOR TUESDAY MAY 20

Record heat is on tap for the local forecast area the next few days due
to the presence of a very warm and relatively dry air mass in
conjunction with a very strong upper level ridge.  Nil cloud cover will
mean that local ozone production will be very efficient; afternoon west
to northwesterly winds will tend to move the plume toward and over east
valley areas.  Forecast streamline charts indicate that by Tuesday
morning low-level (~5K') flow will have become increasing conducive for
the transport of additional ozone and its precursors from central and
southern California - where unhealthy ozone levels were detected on
Sunday - toward the Phoenix metro area.  Similar situations in the past
have resulted in locally unhealthy ozone concentrations absent record
heat; thus, since Tuesday's ozone levels may reach well into the
Unhealthy for Sensitive Groups AQI range at some northeast and east
valley locations, a High Pollution Advisory has been issued.  Ozone
levels may remain high on Wednesday at which time strong and gusty winds
associated with the arrival of a strong but dry cold front is expected
to generate widespread blowing dust; this situation will be expanded
upon on Tuesday.

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