STRANGE CLOUDS
- Thread starter Juba
- Start date
Guy Birenbaum
Majestic is not the first word that comes to my mind when I see pictures of these clouds. Armageddon would be more appropriate to my mind's way of thinking.
Benjamin
The Living Force
I suppose these are not really 'strange clouds' but I think it's pretty cool.
When wind of the right speed flows around a non-streamlined object, vortex shedding occurs leaving an oscillating flow in the object's wake. The von Karman vortex street is a repeating pattern of that oscillating flow.
Meteorologically, these vortex streets seem to form best from islands in the ocean. There's nothing around but open sky and, since the air is all moving in the same general direction, these 'streets' and can be 400 km (260 mi) long with the low pressure vorticies being usually 20-40 km (12-25 mi) in diameter.
Apparently these are very rare to see from underneath and are best seen from space.
Alejandro Selkirk Island- Sept. 15, 1999. See the link for the original, gorgeous, hi-def image.
Cape Verde Islands- Apr. 26, 2004.
Cape Verde Islands- Jan. 5, 2005. Phrygian caps! Or Greek Meander?
Aleutian I in the Aleutian Islands- May 23, 2007
Jan Mayen Island- Apr. 4, 2012. This island is home the the worlds most northern volcano, Beerenberg.
Heard Island- Nov. 2, 2015
This phenomenon can also be destructive.
When wind of the right speed flows around a non-streamlined object, vortex shedding occurs leaving an oscillating flow in the object's wake. The von Karman vortex street is a repeating pattern of that oscillating flow.
Meteorologically, these vortex streets seem to form best from islands in the ocean. There's nothing around but open sky and, since the air is all moving in the same general direction, these 'streets' and can be 400 km (260 mi) long with the low pressure vorticies being usually 20-40 km (12-25 mi) in diameter.
Apparently these are very rare to see from underneath and are best seen from space.
Alejandro Selkirk Island- Sept. 15, 1999. See the link for the original, gorgeous, hi-def image.
Cape Verde Islands- Apr. 26, 2004.
Cape Verde Islands- Jan. 5, 2005. Phrygian caps! Or Greek Meander?
Aleutian I in the Aleutian Islands- May 23, 2007
Jan Mayen Island- Apr. 4, 2012. This island is home the the worlds most northern volcano, Beerenberg.
Heard Island- Nov. 2, 2015
This phenomenon can also be destructive.
Weatherwatch: vortex 'streets' that can flatten power stations
Oct. 31, 2017
...
Kármán found that air flowing around an obstacle broke away into distinct whirlwinds. At a particular wind speed, the forces involved produce resonance, causing wires to sing in the wind, or towers to wobble.
Two of the three 350ft cooling towers at Ferrybridge, Yorkshire, which were brought down by a Kármán vortex street on 1 November 1965. Photograph: Keystone/Getty Images
A powerful Kármán vortex street occurred at Ferrybridge power station in West Yorkshire, on 1 November 1965. Eight cooling towers, each over a hundred metres tall, had been built only three years previously, but 80mph gusts had a catastrophic effect. The four towers on the windward side stood firm, but those behind were buffeted by vortices from those upwind. At 10.30am one tower collapsed, followed by two others over the next hour. Fire damaged the remaining five towers. Fortunately, nobody was hurt.
naorma
Dagobah Resident
I saw something similar yesterday afternoon but much more smaller and if I look at this picture it might be that I only saw the "foot" of the "mushroom" - I dont know how to describe it better -- - I did take a picture but my camera is so bad one cannot see anything . . . But I am glad that there are more pictures.
I saw something similar yesterday afternoon but much more smaller and if I look at this picture it might be that I only saw the "foot" of the "mushroom" - I dont know how to describe it better -- - I did take a picture but my camera is so bad one cannot see anything . . . But I am glad that there are more pictures.
Another photo from another perspective. Trujillo Alto, Puerto Rico
(Oct 16, 2023)
Jory
Expressions of nature. A sinister photo of a night in Andujar, Spain on October 27, 2023. Photo: Vicente.Relatos
