Fri Jan 9 10:30:52 MST 2009


For transportation alternatives:

Health message for Friday, January 9: Unusually Sensitive People should
consider limiting prolonged exertion outdoors.

Health message for Saturday, January 10: Unusually Sensitive People
should consider limiting prolonged exertion outdoors.
Synopsis and Discussion
   The Phoenix forecast area's visibility has definitely deteriorated as
the week progressed.  The good news is that a disturbance rotating south
along the east side of a ridge of high pressure will push through
Arizona late Friday through Saturday.  This will likely send some mid
and high level clouds through the region, but more importantly, it will
increase surface winds which should help clear some of this accumulating
pollution out of the Valley.  No rain is expected.  That ridge will
strengthen on Sunday and push east.  It will amplify, stretching all the
way north into Alaska, blocking any further disturbances from impacting
the western U.S. through next week.  Warming will also take place, with
temperature reaching the mid 70s by the middle of next week.
   As mentioned, particulate levels have steadily increase throughout
the week with Coarse Particulates (PM-10) nearing the "Moderate" range.
Fine Particulates (PM-2.5) have comfortably settled in the middle part
of that category.  PM-10 levels may increase further on Saturday with
the increased winds, a result of possible periods of blowing dust.  By
Sunday, however, conditions should improve and we may see a day or two
early next week in the "Good" range before rebounding under that strong
ridge of high pressure.  Check back on Sunday for the latest.  Until
then, have a great weekend!  -J.Paul  

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