[wxqc] CWOP Information for CW4490 (C4490) in Leander, TX US

Mon Jun 2 17:49:11 CDT 2008

Thanks for the response.  I had forgotten until you mentioned altimeter and
barometer in the same sentence,that I relocated both my station and console
to a slightly higher elevation and Long/Lat.  I forgot to update the sw with
the revised data.  This may be the issue.

Thanks.
Joe

  _____  

From: wxqc-bounces at lists.gladstonefamily.net
[mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of Victor Engel
Sent: Monday, June 02, 2008 9:36 AM
To: Discussion of weather data quality issues
Subject: Re: [wxqc] CWOP Information for CW4490 (C4490) in Leander, TX US

Perhaps someone can correct me, but I don't think being located in a valley
would have any bearing on altimeter, at least during calm weather, as long
as your altitude is entred correctly.

Victor

On Mon, Jun 2, 2008 at 7:04 AM, JBothne <jbothne at austin.rr.com> wrote:

Thanks for the responses.  Since;

*	

	My software version is Weatherlink 5.7.1,
*	

	My daily variances match and track similarly to nearby stations with
the exception of the
<http://weather.gladstonefamily.net/site/C4490?tile=10;baro_date=2008-05-22#
baro> 2.2 milliBars difference,
*	

	My normal temperature readings tend to be slightly cooler than
surronding stations.  I am located in a valley,
*	

	The only change that I've noted of recent is that I changed upload
servers, based on recent CWOP correspondence, since this time I have
received the failed analysis reports ,
*	

	the email discussions,
*	

	and all other analysis passes,
http://weather.gladstonefamily.net/site/C4490?tile=10;days=182#Data
*	

	other stations are experiencing similar issues,

I have to conclude that this issue is not isolated to my station but may be
related to either the software, geographical location or the analysis not
taking into account site location variables past a standard deviation, that
there is not much that can be done from my end to correct the issue.

Am I missing something?

Regards,
Joe
Cordially, 
Joseph A. Bothne 
Hm: 512-259-8476 
Fax: 512.259.8781 
mailto:jbothne at austin.rr.com 
Homepage: http://home.austin.rr.com/thebearcave/ 

  _____  

From: wxqc-bounces at lists.gladstonefamily.net
[mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of Victor Engel
Sent: Sunday, June 01, 2008 5:12 PM 

To: Discussion of weather data quality issues
Subject: Re: [wxqc] CWOP Information for CW4490 (C4490) in Leander, TX US

You seem to be in a similar situation to me. I have two "official" stations
nearby, KATT, which is at Camp Mabry, and KAUS, which is at Austin
Bergstrom. KATT is closer (3.4 miles, vs. 11.7 miles) and located in an area
more similar to mine than KAUS, so I expect it to track mine more closely.
However, I don't trust it. It frequently has spikes in the data where the
value changes by a millibar from what one would expect from a smooth graph.
There's another station less than a mile from me that tracks mine very
closely. They were even with each other until I made an adjustment last
year. They still track each other closely, but separated by the offset I
entered last year.
http://weather.gladstonefamily.net/qchart/C6155?date=20080601
<http://weather.gladstonefamily.net/qchart/C6155?date=20080601&addnl=AS425&a
ddnl=KATT&addnl=KAUS&Add+to+charts=Add+to+charts&.cgifields=addnl>
&addnl=AS425&addnl=KATT&addnl=KAUS&Add+to+charts=Add+to+charts&.cgifields=ad
dnl
That close station also uses Davis Vangate Pro hardware.

When I'm really interested in accuracy, for example, around the time I
decided to make an adjustment, I wait for a period of calm winds and
relatively constant barometric pressure. That way I'm less likely to run
into local variability. Then, I rely on the output of KAUS.

Victor

On Sun, Jun 1, 2008 at 4:45 PM, Radiocatus <jhlists at earthlink.net> wrote:

I, too, have a Davis VP2, and obsessed for a while about variations in
my readings from the MADIS analysis. I finally decided to use the
pressure from KONT (Ontario International), about 10 miles away as an
indicator since should be regularly serviced and calibrated. My VP2
stays within about 0.2mb of KONT, although the MADIS analysis varies a
bit due to the several PWS that are included in the analysis.  KPOC
(Brackett Field) is only about a mile away, but it no longer reports
temperature, humidity, or rainfall, the anemometer jumps directly from 0
to 6mph (bad bearings?), and only reports during tower hours. I don't
trust it.

I've concluded that my temperature and humidity/dewpoint variations are
due to microclimate variations stemming from my proximity to a large
reservoir (Puddingstone) about 1.5 miles from my location and upwind
from me most of the time. MADIS has fits with that.

-Jay AS789

Victor Engel wrote:
> Please note that when I said I noticed a suspected variation in
> pressure, I was referring to the difference between my reading and the
> analysis, not a variation in pressure. I know there is a daily
> fluctuation in pressure. Presumably it should be the same for everyone
> in the vicinity.
>
> Also, just because a sensor is indoors doesn't mean that it's immune
> to temperature variations. Such a notion presumes indoor temperature
> is constant. Over the past 6 months or so my indoor temperature has
> varied from about 46 to 86. I allow indoor temperature to vary for
> economical reasons.
>
> Anyway, I haven't confirmed the effect I described. It might not even
> be there. What I seem to notice, though, is that my readings are more
> likely to be lower than the analysis during warm weather than during
> cold weather. The difference is slight, since my QC tends to hover
> between 98% and 100% for barometer.

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