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Hurricane Formation

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining the anatomy of a hurricane, and how it forms.

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We saw in the weather update that the storm in the Atlantic Ocean is now tropical depression. 00:00:00
We're afraid that it's going to affect our trip to Tampa. 00:00:05
So we need to know, how does a storm grow and become a hurricane? 00:00:08
First, you need to know a little bit about pressure systems and how they form on Earth. 00:00:12
We learned about air pressure from Dr. D. Is this the same thing? 00:00:16
There are two types of air pressure systems, high and low. 00:00:20
The uneven distribution of the Earth's surface causes them to form. 00:00:23
So you mean that's why it's hotter at the equator than at the north and south poles? 00:00:27
Exactly. And we also have local temperature variations depending on the land's surface type. 00:00:31
These local temperature variations cause air to rise in some areas and to sink in other areas. 00:00:36
This rising and sinking motion causes high and low pressure areas in the atmosphere. 00:00:41
What do high and low pressure systems have to do with the tropical storm? 00:00:45
We have regions in the tropics that are warmer and cooler than other regions. 00:00:49
Low pressure forms in the warm regions and once they form, they move from east to west. 00:00:54
I remember we learned in the case of the mysterious red light that winds in the tropics are called trade winds. 00:00:58
These winds move from the east to the west. Is that why they move in a westerly direction? 00:01:03
Yes, and as low pressure areas move over the warm tropical oceans, 00:01:08
they gather heat and moisture from the ocean and cause thunderstorms. 00:01:12
The rain and the thunderstorms warms the atmospheric air column. 00:01:16
That causes the surface pressure to lower, thus strengthening the low pressure area. 00:01:20
So as the warm air rises, the pressure in the system gets cooler. 00:01:24
Something like that. The middle and upper atmospheric winds take away air from the low pressure areas 00:01:28
and deposit them in the high pressure areas. 00:01:33
And we end up with very small but intense low pressure areas and very weak but large high pressure areas. 00:01:36
And what's the third way? 00:01:42
That happens when a hurricane forms an eye. 00:01:44
An eye? I know he doesn't mean a real eye. 00:01:46
No. No, it's the center of the hurricane where there is no cloud. 00:01:50
Air is sinking near the center of the hurricane and as it sinks, it warms up dramatically. 00:01:55
That warming causes the hurricane to intensify rather dramatically. 00:02:00
Dr. V told us that wind is formed when air moves from an area of high pressure to an area of low pressure. 00:02:04
Do the winds of a hurricane increase as the pressure drops? 00:02:09
Yes, and the winds typically increase as you move toward the eye or the center of the hurricane. 00:02:12
In strong hurricanes, the winds can vary rather dramatically. 00:02:17
About 20 miles per hour on the outskirts of the hurricane 00:02:20
to more than 150 miles per hour near the center in the eye wall of a hurricane. 00:02:23
Is the wind the fastest in the eye? 00:02:28
Actually, that's a common misconception. It isn't. 00:02:31
The winds are strongest just outside the eye and decrease rather dramatically toward the circulation center 00:02:34
where they're oftentimes light and variable. 00:02:39
Sounds like a place to be in a hurricane. 00:02:41
Is there a particular time of year hurricanes are more likely to form? 00:02:43
That's a great question. 00:02:47
And in the northern hemisphere, it's June through November 00:02:49
when the sea surface temperatures are warmest and the land areas are hottest. 00:02:52
It's ideal for hurricane formation. 00:02:56
You've given us a lot to think about. 00:02:58
You're welcome. I'm glad I could help. 00:03:00
Be sure to watch the Weather Channel for all the tropical storm and hurricane advisories and updates. 00:03:02
You also might want to visit the NASA Y-Files website's research rack 00:03:07
and check out the link to the Weather Channel. 00:03:12
We will. Thanks. Goodbye. 00:03:14
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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:
336
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
03′ 16″
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:
19.76 MBytes

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