[wxqc] Barometer Errors

[Philip Gladstone]

George,

The URL 
http://weather.gladstonefamily.net/cgi-bin/wxsite.pl?site=c1523;tile=10;baro_date=2006-04-07;days=91;fit=1;asosonly=1

adds a couple of undocumented features. One of them only excludes the 
CWOP stations from the comparisons stations at the bottom. The other 
performs a lineat best fit analysis to see what the best fit function is 
between your data and the analysis data. This can show up problems where 
the error is not just a simple offset in the data, but also a scaling 
factor as well.

I think that this latter case is the issue in your case. Isn't there an 
issue with weatherlink performing the wrong pressure reduction to get to 
sea level pressure? [Someone more knowledgeable than me please chime in].

Philip

George Prevelige wrote:
> I try not to take it personally when I receive a whole page of errors in my
> daily Weather Quality Report. But this barometer issue is starting to bother
> me.
> 
> 90% of the time, my report is error free. But, periodically, normally before
> a front comes through, my barometer readings deviate above the margin of
> error. I understand that a front can cause local anomalies, but what about
> the times between fronts when I get these errors (like today - I had 51/96
> barometer errors, 0/96 for all other readings)? 
> 
> Before I start tweaking my barometer, are there any other explanations for
> my readings to be 2 to 3 MB (usually lower than sample) off the reference
> data, only to be back in sync a day or two later?
> 
> Others have voiced concern about incorrect or absent comparison data near
> their site. There are no sites within 10 miles of my station that have
> consistent or even useable data.
> 
> George
> CW1523
> Vantage Pro
> Weatherlink
> 
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