I'm an aerospace engineer and a pilot. The downdraft is so dangerous to an aircraft because you get the headwind and tailwind combo in a short period of time. Imagine being on the glide path and realizing you're suddenly above it because the headwind creates more lift over the wings, so to compensate you'll reduce power. You're taught power for altitude, and pitch for airspeed. Well the plane starts dropping in altitude because the pilot set the power accordingly, but the next thing you know the winds shift to a tailwind and you're dropping even faster. You're also trimmed for a descent rate so that's changing too. By the time you power back up and re-trim to go around it's too late. With jets there's a delay between setting power and power actually being delivered by the engines. Even if you did set power fast enough the tail wind keeps the aircraft from getting enough relative wind over the wings to produce enough lift to stay airborne. Very dangerous indeed. Closest thing I've experienced was an unexpected wake vortex and that was enough to feel my heart leap out of my chest.
I'm not a scientist, but I am an avid science consumer. I love that in 2021 I can just click a video like this and listen in on a discussion at this level.
I am only halfway through this but I really enjoy this! Wet air being lighter than dry air took me by surprise, never thought about it and by intuition would have picked the wrong answer. Also, I love that the english language has adopted the german word graupel for small hail :)
Leigh, I’m a microbiologist who is fascinated by atmospheric science. I’ve seen all your simulations and lectures on here, and I love them all. Some of us do understand some physics, and your talks are highly informative. Please keep posting.
I can't even imagine trying to scale these simulations up to the larger scales that downburst clusters occur at or even how complex and interesting the interactions are as something like a derecho event occurs.
I wish this sort of research data & technology was available to the hobbiests. As a storm / atmospheric science nut living in a region where very little research has been done on misoscale events, I've noticed patterns consistent across different types of events, yet I cannot collate the observed data with any chart or simulation. My observations can only be studied & speculated upon
This is fascinating. As an aviation/meteorology/computer nerd it combines many of my favourite subjects. I guess that with useful quantum computers coming down the pipeline, you'll need some similar advances in date storage and wrangling. I wonder when we'll get to whole-Earth atmosphere sims running at huge resolutions, faster than real-time....determinism here we come..
This is a great presentation. I've often wondered what your simulations of other atmospheric events would be like... I also wonder if you've ever considered including topography into your simulation
24:14 a LOT of planes land at or below 150mph..... (67M/S = 150 mph) . so you could go from 150 knots air speed..... to 0 (or negative) you would literally drop like a rock.... all lift removed
Just wondering…does not the evaporation of rain or melting of snow etc., during a microburst lifecycle release the latent heat of each and every drop of rain or snow flake? Thereby cause and increase of heat to the surrounding air mass? Would this not cause an increase in the ambient temperature? Not, a cooling therefore increasing the air buoyancy?
I thought that each fase change in this "direction" solid to liquid to gas, needs extra energy to change, and heat is energy, so i don't see how the raindrop would "give up" energy and not use it for its fase change, but maybe im wrong.
I'm an aerospace engineer and a pilot. The downdraft is so dangerous to an aircraft because you get the headwind and tailwind combo in a short period of time. Imagine being on the glide path and realizing you're suddenly above it because the headwind creates more lift over the wings, so to compensate you'll reduce power. You're taught power for altitude, and pitch for airspeed. Well the plane starts dropping in altitude because the pilot set the power accordingly, but the next thing you know the winds shift to a tailwind and you're dropping even faster. You're also trimmed for a descent rate so that's changing too. By the time you power back up and re-trim to go around it's too late. With jets there's a delay between setting power and power actually being delivered by the engines. Even if you did set power fast enough the tail wind keeps the aircraft from getting enough relative wind over the wings to produce enough lift to stay airborne. Very dangerous indeed. Closest thing I've experienced was an unexpected wake vortex and that was enough to feel my heart leap out of my chest.
I'm not a scientist, but I am an avid science consumer. I love that in 2021 I can just click a video like this and listen in on a discussion at this level.
I'm generally navier stoked to see a new Leigh video.
I am only halfway through this but I really enjoy this! Wet air being lighter than dry air took me by surprise, never thought about it and by intuition would have picked the wrong answer.
Also, I love that the english language has adopted the german word graupel for small hail :)
Ausgezeichnet :)
Leigh, I’m a microbiologist who is fascinated by atmospheric science. I’ve seen all your simulations and lectures on here, and I love them all. Some of us do understand some physics, and your talks are highly informative. Please keep posting.
Muchas gracias. Increíble trabajo
I can't even imagine trying to scale these simulations up to the larger scales that downburst clusters occur at or even how complex and interesting the interactions are as something like a derecho event occurs.
Hello Mr Orf from 🇬🇧 .
Trust your garden is still fab.
photos.app.goo.gl/SDUtCgBUjhr7MCaQA :) I think those are Japanese windflower. They just bloomed last week and are still blasting off new flowers!
I wish this sort of research data & technology was available to the hobbiests. As a storm / atmospheric science nut living in a region where very little research has been done on misoscale events, I've noticed patterns consistent across different types of events, yet I cannot collate the observed data with any chart or simulation. My observations can only be studied & speculated upon
This is fascinating. As an aviation/meteorology/computer nerd it combines many of my favourite subjects. I guess that with useful quantum computers coming down the pipeline, you'll need some similar advances in date storage and wrangling. I wonder when we'll get to whole-Earth atmosphere sims running at huge resolutions, faster than real-time....determinism here we come..
This is a great presentation. I've often wondered what your simulations of other atmospheric events would be like... I also wonder if you've ever considered including topography into your simulation
24:14 a LOT of planes land at or below 150mph..... (67M/S = 150 mph)
.
so you could go from 150 knots air speed..... to 0 (or negative)
you would literally drop like a rock.... all lift removed
Just wondering…does not the evaporation of rain or melting of snow etc., during a microburst lifecycle release the latent heat of each and every drop of rain or snow flake? Thereby cause and increase of heat to the surrounding air mass? Would this not cause an increase in the ambient temperature? Not, a cooling therefore increasing the air buoyancy?
I thought that each fase change in this "direction" solid to liquid to gas, needs extra energy to change, and heat is energy, so i don't see how the raindrop would "give up" energy and not use it for its fase change, but maybe im wrong.
your comment is confusing but , yes some downbursts can be so called heat bursts which increase the temperature
Ope glad TH-cam algorithm recommended this upload.
🇺🇲😎⚓🍺🌀☔🌦️
Everyone loves equations ... classic :-)