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Wind Direction

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining how wind travels and how it carries smell.

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Hi. Aren't you the guy we saw on TV? 00:00:00
That's me. I'm Craig Moeller. I'm one of the meteorologists here at Channel 13. 00:00:03
Yeah. We see you on TV all the time. 00:00:07
You're always telling us about the weather. You tell us when it's going to rain. 00:00:09
Being on TV is just a small part of my job. A big part is looking at weather maps like these. 00:00:12
They tell me about the temperature, the air pressure, and the wind direction. 00:00:17
Wind direction? That's what we're here to talk about. 00:00:21
You see, we want to be on TV like you. 00:00:24
We're trying to find the source of the stink that KSNN reported. 00:00:27
I heard about that. Maybe I can help you. Come on. 00:00:30
Mr. Moeller, what generates wind? 00:00:34
We get wind when there are differences in the air pressure. 00:00:37
Remember, wind blows from high pressure to low pressure. 00:00:39
Have you ever gone to the beach and maybe blown up a beach ball? 00:00:42
Yeah. 00:00:45
Okay. What happens when you blow it up and you don't put the cap back on the ball? 00:00:46
All the air blows out. 00:00:50
All the air blows out because the pressure inside the ball is greater than the pressure outside. 00:00:51
And when the air moves from inside the ball to out, that's basically wind. 00:00:56
I have a question. Does wind ever change direction? 00:01:00
It sure does. As a matter of fact, I'm going to show you something right over here. 00:01:03
This is a weather station, and one of the instruments you see right on top there, that's called an anemometer. 00:01:06
That's used to measure the strength of the wind, and this up here, this is called a wind vane. 00:01:11
This measures the direction, and as you can see, it's prepared to change with the wind. 00:01:16
Let me show you something over on this computer. This is pretty cool. 00:01:20
This is a weather map. We've got areas of low pressure and high pressure. 00:01:23
As you look at this map, you'll see the winds around high pressure travel clockwise, 00:01:26
and around low pressure travel counterclockwise. 00:01:30
So as we look at that, which way is the wind blowing? 00:01:33
South. 00:01:36
From the south, exactly. Now take a look at tomorrow. 00:01:37
With all of these features moving over to the east a little bit, 00:01:39
we have the high pressure just to the west, low pressure just to our east. 00:01:42
Again, counterclockwise around the low, clockwise around the high. 00:01:46
Which way is the wind blowing? 00:01:50
North. 00:01:51
From the north. 00:01:52
From the north. So as you guys can see, the wind does change direction. 00:01:53
Mr. Mahler, can wind move smell? 00:01:57
It sure can. Wind can move a lot of things. 00:01:59
It can move the smells, it can move water droplets, it can move volcanic ash. 00:02:01
As a matter of fact, when a tornado spins, it can pick up debris, 00:02:06
and the wind can move it for hundreds of miles. 00:02:09
Wow, I didn't know weather was this complicated. 00:02:12
Here, I'll give you the wind direction for each day this week. That might help you. 00:02:15
Cool. Let's take these back to Dr. G's lab, 00:02:18
and we can find the wind direction and track the smell. 00:02:21
We'll have to study them. 00:02:24
Aw, man, that sounds like more work, and I thought we were almost there. 00:02:25
Thanks a lot. This is a really neat place. Maybe we can come back sometime. 00:02:30
Anytime. I'll see you guys later. 00:02:34
Watch for us on KSNN. 00:02:36
I'll be tuning in. 00:02:37
Bye. 00:02:38
See you later. 00:02:39
See ya. 00:02:40
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Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
297
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 41″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
16.16 MBytes

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