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| uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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#1
February 12th 14, 04:05 PM
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Std height above ground for anemometer?
My AWS is at head height. What height should the anemometer really be,
please? Hugh Hugh Newbury www.evershot-weather |
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#2
February 12th 14, 04:24 PM
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Std height above ground for anemometer?
10 metres.
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#3
February 12th 14, 04:25 PM
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Std height above ground for anemometer?
On Wed, 12 Feb 2014 17:05:26 +0000, Hugh Newbury
wrote: My AWS is at head height. What height should the anemometer really be, please? 10 metres. -- Freddie Castle Pulverbatch Shropshire 221m AMSL http://www.hosiene.co.uk/weather/ http://twitter.com/PulverbatchWx for hourly reports |
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#4
February 12th 14, 04:38 PM
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Std height above ground for anemometer?
You can correct to standard height:
Anemo height 3-4m add 20% 5-7 add 10% 8-13 no correction |
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#5
February 12th 14, 04:53 PM
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Std height above ground for anemometer?
On 12/02/14 17:38, Desperate Dan wrote:
You can correct to standard height: Anemo height 3-4m add 20% 5-7 add 10% 8-13 no correction So from headheight might be +30%? Hugh |
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#6
February 12th 14, 05:15 PM
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Std height above ground for anemometer?
2 metres is +30%.
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#7
February 12th 14, 05:11 PM
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Std height above ground for anemometer?
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 |
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#8
February 12th 14, 05:22 PM
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Std height above ground for anemometer?
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 |
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#9
February 12th 14, 07:20 PM
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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 |
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#10
February 12th 14, 06:54 PM
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Std height above ground for anemometer?
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 -- Brian Wakem Lower Bourne, Farnham, Surrey http://www.brianwakem.co.uk/weather/latest_obs.txt http://www.brianwakem.co.uk/weather/...am%20Vale.html |
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