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Hurricanes and Meteorologists - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect Segment explaining the fundamentals of hurricanes and how meteorologists predict hurricanes. The video also features a meteorologists from The Weather Channel to explain how data is collected and how hurricanes are predicted.

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Today, NASA Connect is at Keesler Air Force Base in Biloxi, Mississippi. 00:00:00
Why? 00:00:06
This is the home of the Hurricane Hunters, the only military unit in the world 00:00:07
to fly directly into a hurricane and collect data on a routine basis. 00:00:12
We'll meet one of these hunters a little later, but first, let's learn more about hurricanes. 00:00:16
A hurricane is a violent tropical storm with damaging winds and torrential rain. 00:00:21
Hurricanes can form in the Atlantic, Pacific, and Indian Oceans. 00:00:27
Hurricanes are given other names in different countries, 00:00:31
such as a typhoon in Southeast Asia, a baguio in the Philippines, and tropical cyclones in Australia. 00:00:34
How does a hurricane form? 00:00:42
A hurricane gets its energy from the warm, moist air at the ocean's surface. 00:00:44
As this air ascends to form clouds, more air is drawn into the hurricane. 00:00:49
Clouds in the ocean spiral inward, and we begin to see the familiar shape of a hurricane. 00:00:54
At the center of a hurricane, the air descends, 00:00:58
forming a very quiet eye with a ring of clouds surrounding it. 00:01:01
The weather in the eye is much different from the weather surrounding it. 00:01:05
The winds grow calm, and the sky may clear. 00:01:08
Surrounding the eye are bands of heavy rains and very high winds. 00:01:11
When a hurricane comes ashore, it brings high waves, severe flooding, and wind damage. 00:01:15
Hurricanes uproot trees, smash buildings, and destroy power lines. 00:01:21
Hurricane Andrew was the third strongest hurricane to strike the United States coastline on record. 00:01:26
Andrew swept through southern Florida and Louisiana in 1992, causing over $25 billion in damage. 00:01:32
Amazingly, few people were killed, despite the widespread destruction. 00:01:40
When we want to know if a hurricane is going to affect us, we turn to meteorologists. 00:01:44
Meteorologists are scientists who study the causes of weather, like hurricanes, 00:01:49
and try to predict where they will go after they've formed. 00:01:54
More accurate forecasts will help prepare people well in advance of an approaching hurricane, 00:01:57
and in turn, help save lives. 00:02:03
For more on how meteorologists predict hurricanes, we came to the Weather Channel here in Atlanta, Georgia. 00:02:05
Well, Jennifer, in order for meteorologists like me to predict hurricanes, 00:02:11
we need to know at least four variables, temperature, moisture, air pressure, and the most important, wind. 00:02:15
Wind directly or indirectly causes all the damage from a hurricane. 00:02:22
For example, winds produce waves, which cause flooding. 00:02:26
Anyway, the winds in and around a hurricane that push it along and produce its motion are called steering winds. 00:02:29
Steering winds control three things, the speed at which a hurricane will move, 00:02:35
where it will move, and whether it will strengthen or weaken. 00:02:39
Well, Dr. Lyons, it seems to me, then, if you know information on the winds, 00:02:42
then you can easily predict what a hurricane will do. 00:02:46
Well, winds are important, but remember, I also have to look at temperature, moisture, and air pressure. 00:02:48
Okay, all right, so where do you get all that information? 00:02:53
We here at the Weather Channel receive data from weather stations on the ground, 00:02:55
from ships and buoys at sea, from aircraft that fly into the hurricane, like the hurricane hunters, 00:02:59
and from satellites in space. 00:03:04
Because our atmosphere is made up of many layers, 00:03:06
ideally data should be collected at all the different heights or altitudes in the atmosphere. 00:03:09
Therefore, we rely mostly on airborne observations and satellites to measure these variables at different altitudes. 00:03:13
So once you receive the data on temperature, moisture, air pressure, and wind, what do you do with it? 00:03:19
I analyze it. 00:03:25
Along with the data we receive, I look at previous data and how it is changing with time. 00:03:26
I use my experience with past hurricanes to predict the hurricane's strength or intensity and its projected path. 00:03:31
Computers at the National Weather Service in Washington, D.C. receive these data 00:03:37
and input the data into numerical models which generate forecasts. 00:03:41
I receive these forecasts at the Weather Channel in Atlanta, Georgia, 00:03:45
along with forecasts made by the National Hurricane Center in Miami, Florida. 00:03:48
My final forecast is a blend of hurricanes' current track and intensity, my forecast, computer forecasts, 00:03:52
and a forecast from the National Hurricane Center. 00:03:59
Finally, I go on television and make a prediction about the path of the hurricane 00:04:02
and how it might affect people on the coast and inland. 00:04:05
Thanks, Dr. Lyons. 00:04:09
Hey, how would you like to use computer simulations to study the behavior of hurricanes 00:04:10
and then predict their path just like Dr. Lyons? 00:04:15
Shelley Canright has the scoop. 00:04:18
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Idioma/s:
en
Materias:
Matemáticas
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:
589
Fecha:
28 de mayo de 2007 - 16:51
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
04′ 20″
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:
26.02 MBytes

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