[wxqc] Baraometer quality problems

[John Yurciw]

Gerry,

Thanks for the info, to answer some of your questions.....

What's the siting conditions at your location?  The station is located in 
the middle part of my yard, on about an acre of ground around it and it's 
all grass.
Where's your barometer sensor installed?  At the weather station in the yard 
(It's a Davis Vantage Pro2 system)
In the station Inside a tightly sealed house?  Not sealed but protected
Outside in the instrument? Yes.
How'd you determine your elevation?  Using TopoZone maps
GPS?  No, I do not have a GPS unit.
What were the horizontal and vertical datums on the topo map? Not sure the 
answer for this one, I just used the elevation contours shown on the map
Using the CWOP info page for your station, does the location and height 
correspond appropriately?
You mention you've got the station altitude set at 171 meters but the site 
info page says 161 meters. I changed this recently, using the TopoZone map I 
deterimed that I think the elevation should be higher at 171 meters.

Thanks,
John
CW4264

----- Original Message ----- 
From: "Gerry Creager N5JXS" <gerry.creager at tamu.edu>
To: "Discussion of weather data quality issues" 
<wxqc at lists.gladstonefamily.net>
Sent: Sunday, March 12, 2006 1:22 AM
Subject: Re: [wxqc] Baraometer quality problems


> I'm actually much more fascinated by your excursions in temperature and 
> dewpoint.  You're showing some wide swings, despite Dave Helms' recent 
> comments on frequent data insertion into the system.
>
> Regarding your barometric pressure: What's the siting conditions at your 
> location?  Where's your barometer sensor installed?  Inside a tightly 
> sealed house?  Outside in the instrument?  How'd you determine your 
> elevation?  GPS?  If GPS, what datum was entered?  How did you obtain a 
> value (there are real issues with simple averaging although that beats a 
> single spot value)?  Topo map?  What were the horizontal and vertical 
> datums on the topo map?  Using the CWOP info page for your station, does 
> the location and height correspond appropriately?  You mention you've got 
> the station altitude set at 171 meters but the site info page says 161 
> meters.
>
> gerry
>
> John Yurciw wrote:
>> When I get my daily "Weather data quality report",  my */Alt(mb) 
>> /*readings have consistantly been on the high side, about +2.00 to +2.78 
>> and even +2.99. All my other reporting data is fine. My question is, do I 
>> need to check the elevation setting on my Davis Vantage Pro2? If I have 
>> this set incorrectly would this be the reason that I am getting the error 
>> readings from Weather Quality? I currently have it set at 171M Thanks in 
>> advance for the help
>> John
>> http://www.findu.com/cgi-bin/wxpage.cgi?call=CW4264
>>
>>
>> ------------------------------------------------------------------------
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> -- 
> Gerry Creager -- gerry.creager at tamu.edu
> Texas Mesonet -- AATLT, Texas A&M University Cell: 979.229.5301 Office: 
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