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

Mon Jun 2 21:51:59 CDT 2008

Be aware there could be more than one place to update the information,
depending upon the software.

Victor

On Mon, Jun 2, 2008 at 5:49 PM, JBothne <jbothne at austin.rr.com> wrote:

>  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 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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>
>
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