Std height above ground for anemometer?
 

Hugh Newbury wrote:
On 12/02/14 18:11, Ken Cook wrote:
On Wednesday, 12 February 2014 17:05:26 UTC, Hugh Newbury wrote:
My AWS is at head height. What height should the anemometer really be,

please?



Hugh



Hugh Newbury



www.evershot-weather

It's really complicated, Hugh!
10 metres EFFECTIVE height, so any nearby trees and buildings need to
be taken into account within 10x their height from the anemometer.
Some anemometers look really high - say 20 metres, but their effective
height is only 10 metres.
Have a look at the Observers' Handbook if you can, it's all in there.
Only mean speed should be adjusted, gusts remain as read.
Best wishes,
Ken


Thanks all.

Hugh
-------------------------------------------------------
Mine is about 5 metres on my garage roof. As mine is for my own use I
"calibrated" it against a number of readings over a period of time from
nearby official observations. It gives sensible readings most of the
time except when the house blocks it!
Dave

Std height above ground for anemometer?
 

On Wed, 12 Feb 2014 19:54:09 +0000, Brian Wakem wrote:

Hugh Newbury wrote:

My AWS is at head height. What height should the anemometer really be,
please?

Hugh


I used this table for adjusting:

http://wiki.sandaysoft.com/a/Wind_me...t#Compensation

Only works of course for enemometers with an open aspect.

Fort mine, in the middle of a housing estate but currently at 2.5
metres and as far as i can get it from houses, the adjusttment factor
is more than +100% to match the local inland METAR airfield and more
than +200% to match the nearest coastal station 7 miles away.

So I don't bother adjusting, I use it purely to tell me what local
conditions are, down here near the ground, and in a housing estate
which is after all where most people actually live!

My highest speeds this week so far? 9 mph 10 minute mean, 32 mph
gust. And yes, it HAS been windy at times! Perhaps I'll beat that
later today...

--
Dave
Fareham W