[wxqc] Dew Point errors

[Jim Wahler]

Hi Dave,

It's not a vary good comparison.  I live in a 'rain shadow' created by the
Massanutten Mtns.  KOKV and C1500 both get much more rain than I do.  Plus
my station is on a tripod on my roof abbout 25' above the ground.
Do you think I should enter an offset in my VWS program?

Jim

----- Original Message ----- 
From: "Dave Helms" <dshelms at comcast.net>
To: "Discussion of data quality issues" <wxqc at lists.gladstonefamily.net>
Sent: Saturday, 06 August, 2005 13:03
Subject: Re: [wxqc] Dew Point errors


> Hi Jim,
>
> Your dew point is about 3 F degrees too low (measurements too dry) as
> compared to the analysis (e.g. your adjacent stations).  See here in
> comparison to the Winchester Airport (KOKV) observation:
>
http://weather.gladstonefamily.net/qchart/C3977?date=20050806&addnl=KOKV&Add+to+charts=Add+to+charts&.cgifields=addnl
>
> The message says that you need to <add> 7 F degrees to your dew point an
> that day to bring it up to the humidity of the nearby stations.
> However, the 7F degree was just a single day's sample.  I suspect your
> are running 3-4F too dry most of the time.
>
>
> Hope this helps,
>
> Dave
> CW0351
>
> P.S.  You still need to update your position in your VWSAPRS software so
> FINDU plots your station in "downtown" Middletown, as per our previous
> email.
>
> Jim Wahler wrote:
>
> > *I recently began sending data from my WM918 to APRS, after about 15
> > months of uploading to Wunderground.  Yesterday I received a message
> > from wxqc listing a series of 'Observerd Errors' in the Dew Point data
> > to APRS/CWOP.  It indicated that my readings were about 7F too high.
> > On checking the graphs I found that I was actually below the analysis,
> > as well as the other stations near me.  I thought that I needed to
> > adjust my Dew Point, but now I'm confused about how, which direction,
> > and IF I really need to do anything at all.*
> > **
> > *Thanks for your help & suggestions.*
> > *Jim - C3977*
> >
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