[wxqc] Please Help Me Understand

[Richard]

My first thought is to agree with you, to leave it alone for a few weeks and
see what happens. I'm also pretty new to this, and when I first signed up
with the CWOP, I had a pretty significant barometer error. I calibrated it
to the airport (making a correction of two or three milibars), then left it
alone, even though it still showed an error. Eventually it came into
tolerance.
 
Richard, N7TGB (AS399)
 

  _____  

From: wxqc-bounces at lists.gladstonefamily.net
[mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of dean at mevis.org
Sent: Friday, March 09, 2007 9:52 AM
To: wxqc at lists.gladstonefamily.net
Subject: [wxqc] Please Help Me Understand


Please help.  I am pretty new to all of this weather stuff.  And even though
I have a pretty good understanding of statistics, I do not really understand
the reports I am receiving.  Can you someone please review my data and make
some suggestions.  My site is:  CW7327.
 
My station is a Vantage Pro 2.  I have been uploading data to FINDU for
about a couple of months now.  
 
The chronology is approximately this:
 
1) Started 2 months ago uploading data using VWS software.  Was getting some
Temperature errors.  Sometimes just a couple of errors, sometimes 40+.
2) Unhappy with VWS software stability and resource usage so I switched to
Weatherlink about 2 weeks ago.  Now seem to be getting even more errors,
Temperature and Dew Point.
3) One week ago, moved the Temp/Humidity/Rain sensors from above my roof to
just off of my deck.  This lowered the sensors by 20' and gets them away
from my black roof.  Temperature accuracy seems to have improved, but I am
still getting Dew Point errors.
4) Two days ago I realized I had a 5 degree offset plugged in for Humidity
(which affects Dew Point).  I removed the offset and verified the humidity
reading with two other instruments.  Dew Point seems to be improved, but I
am still getting Dew Point errors.  
 
The problems seem much worse since I changed to Weatherlink software.  Is
there any reason that VWS software and Weatherlink software would be
uploading different values?
 
I have already re-sited my temperature/humidity sensors.  Any ideas for how
to further improve this?
 
Both before re-siteing and now, there seem to be differences between the
daytime and nighttime errors.  What can I do about that?
 
I have made a number of changes in the last week which affect my data.  Does
Madis need to re-establish my area "norms"?  How long does this take? 
 
Should I just stop making further changes for a month and see how things
look then?
 
 
Any insight or help would be appreciated.
 
 
Thank you.
 
Dean Mevis
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