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More Air Pressure And Hurricane Prediction

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining, overall, the different factors that affect the life of a hurricane.

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Hi Dr. D. Hi guys, I have my tornado box finished, do you want to see it? 00:00:00
Sure! 00:00:07
What's the probability that it will work? 00:00:08
Remember, we won over probabilities last time we were here. 00:00:10
You've been talking about hurricanes for too long. 00:00:13
Here we go. 00:00:16
That is really interesting. 00:00:25
How does it work? 00:00:27
In this case, it doesn't spin because of the Coriolis effect. 00:00:28
The fan pushes the air out the top, and then air going through the slots on the sides is formed into a vortex with a counterclockwise rotation. 00:00:31
So what's happened? 00:00:39
We think it's going to be okay to make our trip to Florida. 00:00:41
How do you know? 00:00:43
Let's start with clouds. 00:00:44
We learned that clouds form as warm, moist air rises and cools. 00:00:46
This cool air condenses to form clouds. 00:00:49
It's this condensation that gives energy to hurricanes. 00:00:51
Do you know why the air cools when it rises? 00:00:54
No, I hadn't thought about it. 00:00:56
Moist air rises to a higher elevation with less pressure, it expands. 00:00:58
Expansion is a cooling process. 00:01:02
Let me show you. 00:01:04
Blow on your hand like this. 00:01:05
It's pretty warm. 00:01:09
Now blow with your lips like this so the air has to expand. 00:01:11
Neat, it's much cooler. 00:01:16
Isn't science wonderful? 00:01:18
I'm sorry I interrupted you, keep going. 00:01:19
We've been watching the hurricanes very carefully and plotting its location on the hurricane tracking chart. 00:01:21
We know that hurricanes in our part of the world start in the Atlantic tropical waters and move to the west. 00:01:26
That's right, they're pushed along by the trade winds. 00:01:31
Dr. Brown taught us how LiDAR measures the amount of water vapor in a hurricane. 00:01:33
That's important because the amount of water vapor determines the strength of the storm. 00:01:37
Don't forget what the hurricane hunters were able to find out. 00:01:41
We learned that there are a lot of factors used to predict the probability of landfall. 00:01:44
But we think the key to this case is a high-pressure region in the southeast part of the United States that may block the approach of the storm. 00:01:49
What do you think, Dr. D? 00:01:55
Sounds like you really worked hard on this. 00:01:57
A high-pressure region can certainly affect the path of a hurricane. 00:01:59
But remember, we can only talk about probabilities. 00:02:02
You can't know for sure. 00:02:04
Wait, here comes a Weather Channel report. 00:02:06
Hurricane Ichabod has been quite active the last 12 hours. 00:02:08
The eye of the storm was tracking northwestward. 00:02:12
But if you recall, a high-pressure system building in the southeast is becoming stronger and moving towards the hurricane's path. 00:02:15
Now, when these two systems collide, the ridge of the high pressure is causing the storm to curve its track into a northeasterly direction. 00:02:23
Therefore, the hurricane watch has been discontinued over Florida. 00:02:31
The News Channel just confirmed our hypothesis. 00:02:36
We think there's a high probability that the high-pressure system will keep the storm off the shore. 00:02:40
So we've decided to go to Florida. 00:02:45
Well, I certainly hope that you're right. 00:02:47
I was going to a conference in Florida. I decided to stay here instead. 00:02:49
You may be missing some nice weather. 00:02:53
Well, I don't think I want to take any chances. 00:02:55
Okay, Dr. D. You may be sorry. 00:02:58
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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:
347
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
03′ 01″
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:
18.21 MBytes

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