[wxqc] Consistent Dew Point errors

[Sam Drinkard]

Jim,

I'm not intimately familiar with the WMR938, but looking at your graphs, 
my first suggestion would be to raise your temperature sensor 
temperature by 1.0 degree. If you have humidity adjustments, you might 
also bring them up perhaps 1.5 or even 2 degrees, but no more than that, 
let it settle in and see what happens. The trick to getting good results 
is more patience than anything else. Having a stable atmosphere over you 
helps immensely, but your humidity readings are definately reading about 
2-4º too low. Get that squared away, and the DP will follow along 
automagically.

Cheers!

Sam

the_biggerstaffs wrote:

> I have been running an Oregon Scientific WMR938 weather station as 
> little over one year but I am admittedly a novice at weather data. I 
> run Free WX-Wi 1.00 software and upload data every five minutes to 
> CWOP /APRSWXNET as N0TKN and Weather underground as kmojefe15. 
> (http://www.wunderground.com/weatherstation/WXDailyHistory.asp?ID=KMOJEFFE15 
>
>
> While the station performs to my satisfaction I am getting consistent 
> Weather QC reports indicating Dew Point errors. The following link 
> displays an example that is not as bad as most lately. Is my 
> assumption correct that dew point is a calculation derived from the 
> temperature and relative humidity? If so is the calculation done in my 
> software or on the web sites where I upload the data. The temp and 
> humidity data doesn’t seem to be that far off the norm but dew point 
> varies wildly. Since there aren’t very many stations in my area, I 
> would like the data to be as accurate as possible. Suggestions are 
> welcome.
>
> Thanks, Jim
>
> http://weather.gladstonefamily.net/qchart/AR789?date=20060223
>
>
>