[wxqc] Dew Point Error for CW6532 Tucson

[Phil Gilmer]

Hi,

I have a relatively new (June 06) Davis Vantage 2 set up on my roof (6'
mast attached to the parapet) here in the foothills of the Rincon Mountains
in Tucson and am recently getting reported errors for dew point. I notice
there is also a significant difference in my temperatures at night vs the
analysis (my actual readings are higher by over 10F just before sunrise )
which are explained in the quality report as likely due to proximity to
metro area. Do you think I need to consider having the sensor
re-calibrated?

There is a significant mean error in your dew point readings. You may need
to calibrate your dew point sensor. Adjust your sensor to read 3.0 °F
higher. Your readings are not within an acceptable error range. The
automated problem analysis cannot identify the problem. You can sign up on
the wxqc mailing list and post information about this situation there. This
is may be caused by poor siting of the sensor (e.g. under eves, in screen
porch, or in thick tree coverage). For information on siting, see CWOP
Station Guide.

I agree with the post I saw today re posting known error factors; these
would be good to know.....   Also wonder how much data (days, weeks?) are
considered a valid statistical sample?

By the way the unit is on the tallest part of the house and not near flues
or vents. The house is situated on a ridge that is approx 40-50 ft higher
than the arroyos on either side.  The drive way goes through one of the
arroyos and if I walk thru at night or early in the morning the temperature
is noticeably cooler near the bottom. Also noticed the rare fog collects
there as well. Please let me know what you think or if you could use more
information. Thanks!


Phil
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