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

Mon Jun 2 09:36:22 CDT 2008

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 2.2 milliBars<http://weather.gladstonefamily.net/site/C4490?tile=10;baro_date=2008-05-22#baro>
>     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 <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&addnl=AS425&addnl=KATT&addnl=KAUS&Add+to+charts=Add+to+charts&.cgifields=addnl
> 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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>
>
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