Tue Oct 28 11:14:56 MST 2008


For transportation alternatives:

Health message for Tuesday, October 28: Unusually sensitive people
should consider reducing prolonged or heavy exertion.

Health message for Wednesday, October 29: Unusually sensitive people
should consider reducing prolonged or heavy exertion.

Synopsis and Discussion
   Well, it looks a bit better outside today than it did yesterday.
Winds are still blowing out of the east, but the dust has settled so to
speak.  High pressure is currently over the region, centered in northern
Arizona.  The gradient has relaxed a bit and the back-door cold front
responsible for the strong easterly winds and region-wide blowing dust
has moved east.  We will see much calmer conditions the next few days
under mostly sunny skies.  Afternoon desert temperature will continue to
be in the low to mid 90s through Friday.  An approaching trough of low
pressure could shake things up a bit by this weekend.  
   Hopefully most of the remain dust clears out today before lighter
winds and decreased mixing results in stronger morning inversions which
would trap any remaining pollution.  We're keeping the forecasted
Particulate concentrations in the mid to upper part of the "Moderate"
range through the rest of the week.  It's unlikely that any further
Health Watches or HPAs will be necessary during this period.  As the
trough of low pressure approaches this weekend, winds will increase and
turn out of the southwest.  Lack of moisture this far south means the
potential for more blowing dust.  We'll keep an eye on the situation as
it continues to develop.  Check back tomorrow for the latest.  Until
then, have a good day!  -J.Paul

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