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Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Cumulus MX V4 beta test release 4.0.0 (build 4019) - 03 April 2024
Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
Possible Beaufort Number Bug
Moderator: mcrossley
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Possible Beaufort Number Bug
During yesterday's storm Ciara, my wind speed got up to 31mph. <#Tbeaufort> returned F7 and <#Tbeaudesc> returned Near Gale which is absolutely fine.
Looking at my 'yesterday' page, <#Ybeaufort> is returning F6. But <#Ybeaudesc> is returning the correct 'Near Gale' description.
Looking at my 'yesterday' page, <#Ybeaufort> is returning F6. But <#Ybeaudesc> is returning the correct 'Near Gale' description.
- mcrossley
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Re: Possible Beaufort Number Bug
What is your <#windYM> tag showing?
31 mph should be F6 - Strong breeze.
31 mph should be F6 - Strong breeze.
- mcrossley
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Re: Possible Beaufort Number Bug
But I see why 31 mph is producing different values for the number and description - it falls right into a rounding error issue in the description function. I'll fix that.
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Re: Possible Beaufort Number Bug
31.0
I was looking at my website when the wind got to that speed and <#Tbeaufort> definitely said F7 with the description of near gale. <#Ybeaudesc> is saying near gale.
Edit: Ahh I see. Phew! It wasn't me going lala then?!
I was looking at my website when the wind got to that speed and <#Tbeaufort> definitely said F7 with the description of near gale. <#Ybeaudesc> is saying near gale.
Edit: Ahh I see. Phew! It wasn't me going lala then?!
- mcrossley
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Re: Possible Beaufort Number Bug
OK, there are three functions that calculate the Beaufort force, one outputs the number as string, one as a number, one as a description.
The number/string, and description both have rounding errors, the numeric one is correct. I have fixed it so that there is only a single function to do the conversion, and the others just call that one!
The calculation is done in m/s, and 31mph = 13.858 m/s. The cutoff for F7 is < 13.9, so 13.858 was being rounded to 13.9 and incorrectly interpreted as F7
The number/string, and description both have rounding errors, the numeric one is correct. I have fixed it so that there is only a single function to do the conversion, and the others just call that one!
The calculation is done in m/s, and 31mph = 13.858 m/s. The cutoff for F7 is < 13.9, so 13.858 was being rounded to 13.9 and incorrectly interpreted as F7
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Re: Possible Beaufort Number Bug
Tell me if i am wrong that beautfort is related to average wind speed not the wind guest?
https://www.spc.noaa.gov/faq/tornado/beaufort.html
https://www.spc.noaa.gov/faq/tornado/beaufort.html
Desford Weather (at parents)
https://desford-weather.co.uk
Countesthorpe Weather (at mine)
https://countesthorpe-weather.co.uk
https://desford-weather.co.uk
Countesthorpe Weather (at mine)
https://countesthorpe-weather.co.uk
- mcrossley
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Re: Possible Beaufort Number Bug
Correct, it should be average speed not gust. I'm not sure why Cumulus has peak gust values as well.
I use the peak average windspeed for Beaufort values on my website.
I use the peak average windspeed for Beaufort values on my website.
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Re: Possible Beaufort Number Bug
Beautfort according to the met office is related to wind gust then wind average?
Desford Weather (at parents)
https://desford-weather.co.uk
Countesthorpe Weather (at mine)
https://countesthorpe-weather.co.uk
https://desford-weather.co.uk
Countesthorpe Weather (at mine)
https://countesthorpe-weather.co.uk
- mcrossley
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Re: Possible Beaufort Number Bug
Scratch that - deleted post!
All the Beaufort values current, today, yesterday - use average speeds.
All the Beaufort values current, today, yesterday - use average speeds.
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Re: Possible Beaufort Number Bug
If I recorded a peak gust of 54mph yesterday, wouldn't have that shown up as F9?
- mcrossley
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Re: Possible Beaufort Number Bug
Sorry Tina, I deleted my previous post - I was talking through my backside, couldn't read properly. They all use average values, so as you were.
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Re: Possible Beaufort Number Bug
31 mph is 13.858 m/s. Just saying, like But I guess you mean the F7 cutoff is 13.9...
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Re: Possible Beaufort Number Bug
I have worked out the wind average and its not correct.
Desford Weather (at parents)
https://desford-weather.co.uk
Countesthorpe Weather (at mine)
https://countesthorpe-weather.co.uk
https://desford-weather.co.uk
Countesthorpe Weather (at mine)
https://countesthorpe-weather.co.uk