[wxqc] Dewpoints for CW5204... La Crosse WS-2310

Wed Feb 1 21:06:42 EST 2006

Hi Dennis,

You siting is as good as one can hope.

Lets treat stations on a case by case basis.  Here is the last 10 days 
of data for your stations:
http://www.findu.com/cgi-bin/wxpage.cgi?&call=CW4227&last=240

In your station's case, its seems that the humidity sensor is the 
completely unable of reaching saturation/100%.  For locations outside 
the desert and high plains, including Wisconsin, 100% humidity 
conditions are very common.  Therefore, this inability to saturate 
likely accounts for much of your station's "dry bias" for your location.

Looking at the La Crosse WS-2310 manual, page 19:
http://www.lacrossetechnology.info/pdf/pwc/WS-2310.pdf*
*"Measuring Range Rel. Humidity:  20% to 95% (if the relative humidity 
is less than 20% or greater than 95%, it will display 19% or 96%)"
So, it appears the WS-2310 cannot measure 100% humidity because it is a 
design limitation,  no adjustments or hardware failures are possible.*
*
While I'm discussing the WS-2310, its worthwhile to make the point that 
its temperature shield does not offer adequate ventilation in direct sun 
during light winds:
http://lib.store.yahoo.net/lib/lacrossetechnology-at-psmall/tx4u-144a.jpg
I often suggest people with nasty solar spikes to replace the LaCrosse 
shield with a standard Gill (plate) shield.

GaryO:  I know WeatherMatrix used to have a table of performance specs 
of various weather stations.  Does WeatherForum.net maintain an 
up-to-date list such as this???

Dave
CW0351

dennis.carr at supportnow.org wrote:

>I have a Lacrosse WS-2310 station which has the same problem and I
>have been trying to figure out what to do. I built a home made shield
>and with a constant fan drawing air across the sensors and still have
>the problem. 
>I don't have any answers yet. You don't want to adjust with the
>software I'm told. My the sensor is located 20 feet from the house
>mounted on a pole 5 feet off the ground and is located over a grass.
>It says to adjust the dew point 3.3 °F higher.
>http://weather.gladstonefamily.net/site/C4227?tile=10;days=91#Data
>
>Dennis
>CW4227
>
>
> -----Original Message-----
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>Today's Topics:
>
>   1. Dewpoints for CW5204 (John & Delta)
>   2. Station Climate Data Files (Dave Helms)
>   3. Re: Station Climate Data Files (Chris Topf)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Tue, 31 Jan 2006 21:42:04 -0500
>From: "John & Delta" <jdkuhn at adelphia.net>
>Subject: [wxqc] Dewpoints for CW5204
>To: <wxqc at lists.gladstonefamily.net>
>Message-ID: <20060201024153.DKYC8904.mta13.adelphia.net at jacob>
>Content-Type: text/plain; charset="us-ascii"
>
>Hi,
>
> 
>
>   I have a Davis Pro 2 station which I have only had for about 3
>weeks now.
>The analysis for the last 3 days
>http://weather.gladstonefamily.net/site/C5204?tile=10;days=3#Data
>shows a
>significant mean error in the dewpoint readings.  I have the sensor
>set a
>good distance from the house mounted on a pole which is attached to a
>wooden
>post.  The sensor is 5 feet off the ground and located over a grass
>area.
>It says to adjust the dewpoint down 2.6 degrees but I really don't
>want to
>do this unless absolutely necessary as it would be masking the real
>problem.
>Does anyone have any suggestion?
>
> 
>
>Thanks,
>
> 
>
>John
>
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>Message: 2
>Date: Wed, 01 Feb 2006 01:20:08 -0500
>From: Dave Helms <dshelms at comcast.net>
>Subject: [wxqc] Station Climate Data Files
>To: wxqc at lists.gladstonefamily.net
>Message-ID: <43E05318.4040707 at comcast.net>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>Hi All:
>
>Hey... is February 1st, time to start your 2006 climate data
>collection 
>and processing!
>
>My data logging application does not really do what I want it to do so
>I 
>developed my own Excel spread sheet and I populate it every month.
>Over 
>the last several years I have developed a modest station climatology
>of 
>4 years by borrowing from the Baltimore-Washington Internationals
>(BWI) 
>station means and using the station's data as a temporary climatology 
>baseline (in another 6 years I will have enough statistics to form my 
>own station's stats).  I monitor BWI climate data and other area 
>stations to see if my data are in the ball-park.
>
>Here are some examples of the Excel files I have developed for 
>processing my station's climate data:
>
>CW0351 Station Summary for 2005:
>http://mywebpages.comcast.net/brookevilleweather/2005_brookeville-md.x
>ls
>
>CW0351 Template file for 2006 monthly climate data:  note I added
>daily 
>mean max/min temperatures this year
>http://mywebpages.comcast.net/brookevilleweather/2006_blank_brookevill
>e-md.xls
>
>Feel free to download the Excel templates and modify them for your 
>uses.  You can find reference climate data on you local NWS Weather 
>Forecast Office web page or go to the National Climate Data Center 
>(NCDC) and order the closest COOP station climatology.
>
>Local Climate "Clubs":  I belong to the Washington-Baltimore Climate 
>Review (WBCR) which has a 20+ year history of documenting the DC Metro
>
>weather, quite an impressive group run by Brian Smith 
>(bgs11111 at erols.com).  Brian compiles data from 200 area stations,
>plots 
>the data and manually contours the data then snail-mails copies of his
>
>analyzes every month.  I encourage everyone to see if there are any 
>local climate groups to participate in!
>
>Regards,
>
>Dave
>CW0351
>
>
>
>
>
>
>------------------------------
>
>Message: 3
>Date: Wed, 1 Feb 2006 05:17:42 -0800 (PST)
>From: Chris Topf <topfcd at yahoo.com>
>Subject: Re: [wxqc] Station Climate Data Files
>To: Discussion of weather data quality issues
>	<wxqc at lists.gladstonefamily.net>
>Message-ID: <20060201131742.15804.qmail at web53404.mail.yahoo.com>
>Content-Type: text/plain; charset="iso-8859-1"
>
>Dave,
>  thanks for the template submission.  I have had my VP2 weather
>station for about 10 months now and I have been a little disappointed
>in the climate reporting features of the Weatherlink software.  I like
>the overall report, but I am disappointed in that it doesn't contain
>the mean temp calculation like the NWS office monthly reports do and
>that I can't export the report in a tab-delimited format so I don't
>have to manually re-type the information into a spreadsheet.
>  I think you've inspired me to embark on a climate project for my
>station!  Although I've only had my VP2 for 10 months, I've been
>maintaining precipitation records for 10 years this July.  Wow, hard
>to believe it's been that long!
>  
>Chris
>  CW3603
>
>Dave Helms <dshelms at comcast.net> wrote:
>  Hi All:
>
>Hey... is February 1st, time to start your 2006 climate data
>collection 
>and processing!
>
>My data logging application does not really do what I want it to do so
>I 
>developed my own Excel spread sheet and I populate it every month.
>Over 
>the last several years I have developed a modest station climatology
>of 
>4 years by borrowing from the Baltimore-Washington Internationals
>(BWI) 
>station means and using the station's data as a temporary climatology 
>baseline (in another 6 years I will have enough statistics to form my 
>own station's stats). I monitor BWI climate data and other area 
>stations to see if my data are in the ball-park.
>
>Here are some examples of the Excel files I have developed for 
>processing my station's climate data:
>
>CW0351 Station Summary for 2005:
>http://mywebpages.comcast.net/brookevilleweather/2005_brookeville-md.x
>ls
>
>CW0351 Template file for 2006 monthly climate data: note I added daily
>
>mean max/min temperatures this year
>http://mywebpages.comcast.net/brookevilleweather/2006_blank_brookevill
>e-md.xls
>
>Feel free to download the Excel templates and modify them for your 
>uses. You can find reference climate data on you local NWS Weather 
>Forecast Office web page or go to the National Climate Data Center 
>(NCDC) and order the closest COOP station climatology.
>
>Local Climate "Clubs": I belong to the Washington-Baltimore Climate 
>Review (WBCR) which has a 20+ year history of documenting the DC Metro
>
>weather, quite an impressive group run by Brian Smith 
>(bgs11111 at erols.com). Brian compiles data from 200 area stations,
>plots 
>the data and manually contours the data then snail-mails copies of his
>
>analyzes every month. I encourage everyone to see if there are any 
>local climate groups to participate in!
>
>Regards,
>
>Dave
>CW0351
>
>
>
>
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