[wxqc] Dew Point Error for CW6532 Tucson

[Dave Helms]

John,

Yep, that is the problem with a unimount system.  Precip and temperature 
are probably the most valuable for climate and hydrologic 
considerations.  Wind and temperatures are more important for weather 
prediction (modelers need "good" surface winds, e.g. not buried in the 
canopy).   We recommend that people put their temperature and rain gauge 
near 2 meters/5 feet and the anemometer at 10 meters/33 feet or above 
the canopy, obviously; this implied separating the sensor package.

For folks who must compromise (almost everyone does), we have a table in 
the CWOP Guide that considers typical siting option limitations that 
home owners encounter:
http://mywebpages.comcast.net/dshelms/CWOP_Guide.pdf


Dave
CW0351

John James wrote:

> At 08:13 PM 10/3/2006, you wrote:
>
>>  
>> The first thing that catches my eye is that you have the temp/dpt 
>> attached to a 6 ft. sensor from your rooftop (not familiar with the 
>> term parapet, so maybe I'm wrong). While this is fine for the 
>> anemometer and even the rain gauge, the temperature/dpt sensors 
>> should be located at 2m off the ground (5-6 feet). Very sharp 
>> inversions can set up at night, on the order of 5-10F within 30-40 
>> feet of the surface, especially where terrain and standing water 
>> bodies are an issue. Likely you're sampling a "different airmass" 
>> above your roofline than you would be closer to ground level.
>>  
>> Evan
>>  
>>  
>
>
> This brings up something I've been wrestling with a bit. I have a 
> station up at my cabin that has been giving incorrect readings. I have 
> a two story house and a somewhat wooded area in both front and back of 
> my house. I don't have a very good clearing for wind, and was going to 
> move the anemometer to the roof, but I don't think I'm getting good 
> rainfall readings either due to the trees. I was thinking of moving 
> the entire station to the roof, but knew that would alter the other 
> readings. The unit is a Vantage Pro 2 Plus. I get the feeling I'm 
> wrestling with which measurement I want to be more incorrect.
>
> //John
>
>
> ------------------------------------------------------------------------------
> John W. James
> CW4661, CW4663
> Web:  < http://www.jameshillfarm.com/>
>
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