[ADEQ Forecasts] ADEQ: AN OZONE HEALTH WATCH HAS BEEN ISSUED FOR TUESDAY. APRIL 22

[forecasts@lists.azdeq.gov]

http://www.azdeq.gov/environ/air/ozone/ensemble.pdf


Health message for Monday, Apr 21: Unusually sensitive people should
consider reducing prolonged or heavy exertion outdoors. 
 
Health message for Tuesday, Apr 22:  Unusually sensitive people should
consider reducing prolonged or heavy exertion outdoors. 
 
Synopsis and Discussion
AN OZONE HEALTH WATCH HAS BEEN ISSUED FOR TUESDAY APRIL 22
The highest local 8-hour ozone levels of the season occurred on Sunday -
despite relatively cool daytime highs in the mid 80's, southwest to
westerly wind gusts near 30 mph, and typically lower weekend ozone
precursor emissions.  The primary factor contributing to the elevated
ozone concentrations appears to be an influx of additional ozone and/or
its precursors from California on winds in the 5K-10K' layer.  A
supporting piece of evidence was the near-exceedance at Yuma (97 AQI)
where the highest hourly ozone level of 83 parts per billion occurred at
5:00 p.m. Since most ozone monitoring sites around the Valley are
registering higher ozone levels this morning than 24 hours ago, and
since winds will remain conducive to additional transport from
California thru this afternoon, there is the potential for elevated
ozone levels to persist thru Tuesday; as a result, an Ozone Health Watch
has been issued.  Highest ozone levels are expected to occur over the
northeast and east portions of the Valley.  Increasing southwesterly
winds on Wednesday associated with an approaching trough should help
lower ozone levels then.  -Reith

**********************************************************************
NOTICE: This e-mail (and any attachments) may contain PRIVILEGED OR 
CONFIDENTIAL information and is intended only for the use of the specific 
individual(s) to whom it is addressed.  It may contain information that is 
privileged and confidential under state and federal law.  This information 
may be used or disclosed only in accordance with law, and you may be 
subject to penalties under law for improper use or further disclosure of the 
information in this e-mail and its attachments. If you have received this e-
mail in error, please immediately notify the person named above by reply e-
mail, and then delete the original e-mail.  Thank you.