Hi,
With the arrival of the summer months comes the NLC season in the northern hemisphere.
There have been several decent displays already but the one last night was particularly interesting.
My timelapse video is here:
https://www.youtube.com/watch?v=oR9Rvk1 ... FDplXGcF6w
The NLC is moving rapidly in a strong generally ese wind. A rough (and I stress rough) estimate of the speed is 225mph/360kph!
It's a fast air flow up there!
cheers,
Bill.
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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
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
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Noctilucent Clouds
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mcrossley
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Re: Noctilucent Clouds
Nice, not much of a night up there at the moment, not that we have much here either!
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Gordon-Loomberah
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Re: Noctilucent Clouds
Nice work Bill 
Is there there some sort of interference pattern developing for a while there between 2 layers?
Is there there some sort of interference pattern developing for a while there between 2 layers?
Loomberah Weather: http://gunagulla.com
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BillW
- Posts: 67
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Re: Noctilucent Clouds
G'day Gordon,
Great to hear from you! Although not absolutely uniform NLC tends to form in only one layer. These patterns seem to be caused by turbulence.
What generates that turbulence is a matter of debate. Whilst blowing extremely fast, as in this case, there can be quite a steep gradient in air velocity through the mesopause. It is quite a definite boundry (thats why the NLC form there) so that might have something to do with it.
Cheers,
Bill.
Great to hear from you! Although not absolutely uniform NLC tends to form in only one layer. These patterns seem to be caused by turbulence.
What generates that turbulence is a matter of debate. Whilst blowing extremely fast, as in this case, there can be quite a steep gradient in air velocity through the mesopause. It is quite a definite boundry (thats why the NLC form there) so that might have something to do with it.
Cheers,
Bill.