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Hurricane Paths And Landfall

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining how the NOAA predicts hurricane severity and travel patterns.

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Hi, I'm Kaylee, and my friends and I are concerned about the hurricane in the Atlantic Ocean. 00:00:00
We have a trip planned to SeaWorld that we don't want to miss, 00:00:06
so we need to learn more about how to predict when a hurricane will strike land. 00:00:10
Well, you've come to the right place. 00:00:14
The National Oceanic and Atmospheric Administration began in 1970 00:00:16
to help track and predict weather and weather patterns. 00:00:20
We learned that to make a prediction, you sometimes use information you already have. 00:00:23
Do you ever use the tracks of past storms? 00:00:27
Yes. In short terms, such as days or hours, a storm's track may be influenced by a preceding one. 00:00:30
A hurricane churns the ocean as it moves over the ocean's surface, 00:00:36
bringing cold water from the bottom to the top. 00:00:39
Oh, I get it. We learned that a storm needs warm water for energy, 00:00:42
so if the water on the surface is cold, the storm won't be able to grow as big. 00:00:46
That's correct. You've definitely done your research. 00:00:51
We use computers to show us the track of hurricanes we've taken in the past 00:00:54
as a guide to show us where the current storm may go. 00:00:58
Historical records of hurricanes go back to about 1492, the time of Christopher Columbus. 00:01:01
In analyzing the data, scientists have found that every 10 to 30 years, 00:01:06
hurricanes appear to come in different numbers. 00:01:10
This is called the decadal scale. 00:01:13
Scientists study this record so that they can figure out where we are in the cycle. 00:01:15
On average, the Atlantic Ocean has about six hurricanes per season. 00:01:19
Wow, that's a lot of hurricanes. 00:01:23
Yes, it is. And fortunately, not all of them become strong storms. 00:01:26
Some of them don't even make landfall. 00:01:30
We're wondering if a high-pressure system could prevent hurricanes from falling on land. 00:01:32
It is possible. Think of a hurricane as a block of wood floating in a river. 00:01:36
Where the river's currents go, so goes the block of wood. 00:01:41
A hurricane is a storm in a river of air, which moves around the globe. 00:01:44
The currents in this river of air are replaced by areas of high and low pressure. 00:01:49
Since air circulates clockwise around a high-pressure system, 00:01:53
a storm approaching it might be turned to the north or northwest. 00:01:56
If the hurricane does make land, how much land will be affected? 00:02:00
It depends on the size of the storm. 00:02:04
Most storms are about the size of a state, 200 to 300 miles across. 00:02:06
However, in the Pacific Ocean, there are monster storms reaching 1,000 miles in diameter. 00:02:10
Why are they so much bigger than those in the Atlantic Ocean? 00:02:15
The Pacific Ocean is the largest ocean, 00:02:18
so there's a lot more warm water for them to move over, feeding their growth. 00:02:20
Is there more damage on one side of the storm versus the other? 00:02:24
Yes. A hurricane is strongest on its right-front quadrant because it rotates counterclockwise, 00:02:27
and the speed of a hurricane must be added to its wind speed. 00:02:33
So the right-front quadrant is moving faster toward you. 00:02:36
I don't think we want to be on that side of the storm for sure. 00:02:39
Thanks, Ms. Minnelli. This helps a lot. 00:02:43
Anytime. Good luck with your project. 00:02:46
Thanks so much. Bye. 00:02:48
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Idioma/s:
en
Niveles educativos:
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Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
330
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 52″
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:
17.34 MBytes

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