Tue Jan 13 11:30:21 MST 2009


For transportation alternatives:

Health message for Tuesday, January 13: Unusually Sensitive People
should consider limiting prolonged exertion outdoors.

Health message for Wednesday, January 14: Unusually Sensitive People
should consider limiting prolonged exertion outdoors.
Synopsis and Discussion
   Strong inversions continue as high pressure aloft strengthens.  Sunny
skies and mostly light winds will be the rule through the end of the
week with afternoon desert temperatures in the low to mid 70s.  No rain
is expected in the Phoenix forecast area through the weekend.  The
latest model runs are suggesting a possibility of some sub-tropical
moisture being drawn into the region from the southwest by the middle of
next week.  This is based on the ridge giving way slightly to a trough
of low pressure that may dig south at that time.  Early indications are
for the Valley to receive between a quarter and a half an inch of rain
next Wednesday through Friday.  That would be helpful in knocking some
of these particles down.  It's still over a week away, so things can
change.  We'll keep an eye on that scenario.
   Speaking of particulates... both PM-2.5 and PM-10 concentrations were
in the "Moderate" range on Monday and will remain there through at least
Friday.  Strong 10-12 degree inversions have not been breaking until
after noon.  With this limited vertical mixing opportunity combined with
light horizontal winds, the particles continue to accumulate.  Though
residential wood burning has not nearly been an issue compared to what
it was on Christmas and New Year's Eve's/Days, it continues to be a
factor in the deterioration of the local air quality under current
weather conditions.  No health statements are being issued at this time,
but check back daily for any changes.  Have a good day!  -J.Paul  

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