zoidberg
Well-Known Member
Wow! Wouldn't want to be anywhere near that....
Downburst
- Thread starter zoidberg
- Start date
sarabande
Well-Known Member
Intriguing met stuff.
It sounds like less than 1 second between the rain hitting the sea, and the crash into the mike. That's 300 ish meters away. Close enough.
The mechanism also interests me. Presumably air rising causes rain to condense, and the condensed rain builds up until its mass and gravity overcome the upthrust.
If the column of falling water is about 100m across and the 'depth' of rain is 50mm, the volume of water is around 390 mcube or the same in tonnes.
Eeek !
It sounds like less than 1 second between the rain hitting the sea, and the crash into the mike. That's 300 ish meters away. Close enough.
The mechanism also interests me. Presumably air rising causes rain to condense, and the condensed rain builds up until its mass and gravity overcome the upthrust.
If the column of falling water is about 100m across and the 'depth' of rain is 50mm, the volume of water is around 390 mcube or the same in tonnes.
Eeek !
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johnalison
Well-Known Member
I can't help wondering what it would be like to be under it in a boat. Presumably the cockpit would instantly fill to the coamings. There would be nothing much left of the sails. The mast might or might not come down. The hull would be driven down somewhat but would bob up again. Anyone in the cockpit would be severely injured and would be lucky to survive. The hatches might be stove in but I don't think the boat would fill.
sarabande
Well-Known Member
The terminal velocity of a standard raindrop is ~= 10m/s.
Purely on the basis of that video, I estimate the downspeed of the parcel to be about 40m/s. Area of a 30ft boat is 22msq. so v approx 1.1 tonnes of rain arriving in one lump at speed at very nearly 90 mph. Think of a small fast car hitting the boat
Other estimates are available
Purely on the basis of that video, I estimate the downspeed of the parcel to be about 40m/s. Area of a 30ft boat is 22msq. so v approx 1.1 tonnes of rain arriving in one lump at speed at very nearly 90 mph. Think of a small fast car hitting the boat
Other estimates are available
ProDave
Well-Known Member
Am I missing something, I can't see a video or a link?
sarabande
Well-Known Member
ProDave
Well-Known Member
Yes I AM missing something. your post and the OP shows just plain text.
When i quote your message then "MEDIA=facebook]788482072098846[/MEDIA] " appears but I can't see the video or anything else. Very strange.
johnalison
Well-Known Member
Strange. It was OK both on my PC and iPad.
ProDave
Well-Known Member
For anyone else struggling to find it, try this full URL
Бурштинський екологічний Канал : https://www.facebook.com/chenai.fang.775/videos/788482072098846
Бурштинський екологічний Канал : https://www.facebook.com/chenai.fang.775/videos/788482072098846
JohnGC
Well-Known Member
Or it could just be artwork from a CGI designer in Jersey.
Zing
Well-Known Member
It’s a fake. If you look at other videos on her page, she is clearly into fakery.
sarabande
Well-Known Member
Don't think so. What makes it look fake is that is is speeded up.
Try these:-
Microburst & Downburst - YouTube
1.11 is not dissimilar
Try these:-
Microburst & Downburst - YouTube
1.11 is not dissimilar
Zing
Well-Known Member
I disagree. Those are all real and not at all similar. They are speeded up also.
JohnGC
Well-Known Member
zoidberg
Well-Known Member
Perhaps the important thing we can take from this, faked or real, is that such violent downburst do happen and that they are significant to us in small boats....
RichardS
N/A
Zing
Well-Known Member
It is a real danger. Cats have been flipped by microbursts. Sorry to rub it in. ???
RichardS
N/A
sarabande
Well-Known Member
Look at an IRL microburst event. about 10 mins onwards.
Stemar
Well-Known Member
I know climate change is happening, but I rather think that if that starts happening in the Solent, the danger of being being caught in it in one's boat would be the least of our worries. Item number 1,452 on my "this is why I like living where I do" list
