Over the last couple days we've been catching the tail end of Sandy, and watching wind speed closely for the first time in... well, ever. A friend pointed out that average speed is very often higher than gust speed. Confused, I poked back in time and noticed this is true historically as well, most often with higher speeds.
I have "calculate 10 minure wind average" checked. "Use speed for avg calculation" is not checked. From the FAQ, this should mean that "latest" is the most recent gust reading from the weather station, "gust" is the highest value seen in the last 10 minutes, and "Average" is a rolling 10 minute average calculation. (all based on the reported gust value)
Of course, now that I have time to investigate, the wind has died completely, but I'm still at a loss to explain why Average would be higher than Gust. I'm running 1.9.2 build 1032.
Any thoughts?
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Latest Cumulus MX V4 release 4.4.2 (build 4085) - 12 March 2025
Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
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(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
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Wind weirdness
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Charlie
- Posts: 363
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- Location: Whitehorse, Yukon Territory, Canada
Re: Wind weirdness
Graphs for sure. Since I noticed, I check live data but as I mentioned, we are pretty much in dead calm right now.
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steve
- Cumulus Author
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Re: Wind weirdness
Do you have 'plot latest gust' selected? Do you have a PeakGustMinutes or AvgSpeedMinutes setting in cumulus.ini?
It almost looks like it could be displaying one of them in the wrong units.
It almost looks like it could be displaying one of them in the wrong units.
Steve
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Charlie
- Posts: 363
- Joined: Thu 04 Feb 2010 12:22 pm
- Weather Station: 1wire-Cumulus & Fine Offset
- Operating System: Windows 7
- Location: Whitehorse, Yukon Territory, Canada
Re: Wind weirdness
'Plot latest gust' is not selected. I can not find any PeakGustMinutes or AvgSpeedMinutes setting in cumulus.ini
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Charlie
- Posts: 363
- Joined: Thu 04 Feb 2010 12:22 pm
- Weather Station: 1wire-Cumulus & Fine Offset
- Operating System: Windows 7
- Location: Whitehorse, Yukon Territory, Canada
Re: Wind weirdness
I do mix up units in the program, for instance displaying cloud base in feet, but in general I use SI units.
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Charlie
- Posts: 363
- Joined: Thu 04 Feb 2010 12:22 pm
- Weather Station: 1wire-Cumulus & Fine Offset
- Operating System: Windows 7
- Location: Whitehorse, Yukon Territory, Canada
Re: Wind weirdness
Looks like I left a tweak in the multipliers section when I was experimenting a couple weeks ago, where wind speed has a different factor than wind gust by almost double. Sorry - my bad. Thanks for poking, Steve.