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Graph: Wind Speed

Discussion and questions about Cumulus weather station software version 1. This section is the main place to get help with Cumulus 1 software developed by Steve Loft that ceased development in November 2014.
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Altocumulus
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Graph: Wind Speed

Post by Altocumulus »

Is there a bug in the wind speed graph?. From inspection it appears the average speed lags behind the gusts.

Yellow trace on attached graph.
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PaulMy
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Re: Graph: Wind Speed

Post by PaulMy »

Gusts are instantaneous while average is over a period of time so includes all the lower and higher of that period. I think the graphs look fine.

Enjoy,
Paul
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mcrossley
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Re: Graph: Wind Speed

Post by mcrossley »

It will, it's an average of the previous 10 (default) minutes. Until a gust occurs it will cannot be included in the average, but it will affect it for the next 10 minutes.
Altocumulus
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Re: Graph: Wind Speed

Post by Altocumulus »

Thanks guys, but that's not how the Met Office analyses anemographs - or not how they used to!
A gust was analysed within a band of 10 minute averages.
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mcrossley
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Re: Graph: Wind Speed

Post by mcrossley »

Maybe, but for a PWS viewing 'live' data you cannot see what the wind speed will be in future to display the average speed 'now'.
If you are analysing historic data you can take a period centred on the current time.

Looking at my data it doesn't seem to lag as much as yours. What averaging period are you using? And is Cumulus or your station calculating the average?
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Altocumulus
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Re: Graph: Wind Speed

Post by Altocumulus »

Thanks Mark - Cumulus is doing the averaging, and at 10 minute interval.

I guess it's the difference between the old fashioned anemograph analysis, and the electronic averaging.

I'd better gloss over it !
sfws
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Re: Graph: Wind Speed

Post by sfws »

The FAQ does mention divergence from met O practice http://wiki.sandaysoft.com/a/FAQ#What_d ... tations.3F
Altocumulus
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Re: Graph: Wind Speed

Post by Altocumulus »

sfws wrote:The FAQ does mention divergence from met O practice http://wiki.sandaysoft.com/a/FAQ#What_d ... tations.3F
Thanks....
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