[wxqc] Wind Question

[Bryce Alexander]

The problem with setting it under the eaves is twofold. First of all there
is an issue of air stagnation since most eaves completely surround the
temp/humidity sensors in a pocket of air. You will find that the dew point
will be skewed and the temp will be slow to change because of this. The
other problem is that if it isn't the North wall, then when the sun hits
that wall and heats it up the heat will rise and get caught in that pocket
of air giving you a solar radiation problem.

 

There are several issues with urban settings, so it may not always be
appropriate to set your temp and humidity sensors at the recommended four
feet up and 90 feet away from concrete or asphalt. But use as much common
sense as you can to place the sensors in an area where they get the ambient
air flowing across them. Make sure it is well shielded from the sun, and
doesn't get misted when you water your grass. That will be your sweet spot. 

 

  _____  

From: wxqc-bounces at lists.gladstonefamily.net
[mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of Lee GRAVES
Sent: Sunday, June 10, 2007 2:57 PM
To: Discussion of weather data quality issues
Subject: Re: [wxqc] Wind Question

 

How about under the eaves of a house?  Is this a good place to install an
outside temp sensor?   Thanks..............Lee

----- Original Message ----- 

From: Bryce <mailto:bryce at azlab.net>  Alexander 

To: 'Discussion of weather data <mailto:wxqc at lists.gladstonefamily.net>
quality issues' 

Sent: Saturday, June 09, 2007 12:41 PM

Subject: Re: [wxqc] Wind Question

 

In most areas 30 feet is about right, the main thing is to get above the
nearby trees and houses. There is a turbulent zone around and at the top of
these obstructions that will skew your readings.

-----Original Message-----
From: wxqc-bounces at listsgladstonefamily.net
<mailto:wxqc-bounces at lists.gladstonefamily.net> 
[mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of Rich Brunnworth
Sent: Saturday, June 09, 2007 9:30 AM
To: Discussion of weather data quality issues
Subject: Re: [wxqc] Wind Question

 From what I've read, 30 feet is the proper height.

Rich
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RON PARKER wrote:
> Is there a standard or a correct height where the anemometer should be 
> installed?... I have the Davis Vantage Pro 2 weather station?
>  
> T
>
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