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Hurricane Hunters - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect Segment explaining what hurricane hunters do and how they do it. The video explores the instruments they use to collect data from a hurricane and the types of data collected such as temperature, moisture, air pressure and wind.

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Describe the instruments the hurricane hunters use to collect data on a hurricane. 00:00:00
What symbol is used to describe the flight pattern? 00:00:09
Which of the four variables shown in the graph is constantly increasing? 00:00:12
The hurricane hunters are a group of men and women in the United States Air Force Reserve 00:00:15
who fly these airplanes into hurricanes to measure the storms. 00:00:20
The data we collect are given to the National Hurricane Center in Miami, Florida, 00:00:24
who need to know exactly where the hurricane is right now, how strong it is, and what the winds are like. 00:00:28
But, I mean, why do you have to fly into the storm? Aren't satellite images enough? 00:00:33
The National Hurricane Center can get very good estimates of hurricanes from satellite, 00:00:37
but sometimes the hurricanes don't follow the book. 00:00:41
Sometimes it may be difficult to find the eye or center on the satellite picture, 00:00:44
or they may be stronger or weaker than they appear on satellite. That's where we come in. 00:00:48
The more meteorologists know what the hurricane is doing right now, 00:00:52
the better they'll be able to forecast what it will do in the future. 00:00:55
In fact, the measurements collected by the hurricane hunters makes forecasts about 25% more accurate 00:00:59
than just using satellite estimates alone. 00:01:04
This makes a huge difference, especially when you're trying to evacuate people on the coast and save lives. 00:01:06
Okay, Val, so how do you measure a hurricane? 00:01:11
Well, Jennifer, we have weather sensors mounted around the nose of our WC-130 aircraft 00:01:15
and two weather stations inside. Let me show you. 00:01:20
Great. 00:01:22
We collect data from different altitudes or heights along our flight path. 00:01:25
In addition to these weather sensors, we also draw up another weather instrument with a parachute 00:01:29
that collects data from other altitudes as it falls through the atmosphere. 00:01:33
All of these instruments continuously measure temperature, moisture, air pressure, and winds. 00:01:37
The data we collect are immediately sent to the National Hurricane Center. 00:01:42
I get it, but how do you know where to fly into a hurricane? 00:01:46
Good question. First, the National Hurricane Center calls us 00:01:49
and gives us the hurricane's forecasted latitude and longitude. 00:01:52
The navigator plots the hurricane's position on a chart, 00:01:55
then plots our flight path from Biloxi to the storm. 00:01:58
The navigator and pilot then discuss the pattern to fly in the storm. 00:02:01
You see, to make accurate measurements, we fly a pattern that looks like an X. 00:02:05
We start in one corner of the hurricane, then fly to the center of the X, 00:02:08
which is the eye, or center of the hurricane. 00:02:12
Then we fly out at least 105 miles on each leg of the X, each time coming back to the eye. 00:02:14
As we fly this pattern, we collect data on temperature, moisture, air pressure, and wind, 00:02:20
and see how they change. 00:02:24
Two of the most important elements we measure are air pressure and wind. 00:02:26
Let's look at this graph of air pressure and wind that we collected in a hurricane that we flew. 00:02:29
Okay, let me see if I can interpret it. 00:02:34
The horizontal axis begins at the center of the eye of the hurricane. 00:02:36
Then we have the eye wall here, and way out here we have the outer edge. 00:02:40
This vertical axis indicates an increase in intensity. 00:02:44
You're right. Now what do you notice about the air pressure and wind in the eye of the hurricane? 00:02:48
Hmm, let's see. 00:02:51
The intensity of the air pressure and wind is low at the center of the eye of the hurricane, 00:02:53
but it begins to increase as you get close to the eye wall. 00:02:58
That's right, and the lower the air pressure, the stronger the hurricane. 00:03:02
That's important information to know. 00:03:05
Now let's look at the air pressure and wind at the eye wall. 00:03:07
What do you notice? 00:03:10
Wow, the wind really increased in intensity at the eye wall, and the air pressure did too. 00:03:11
You're right, and the air pressure continues to increase as you get to the outer edges of the hurricane. 00:03:17
But if you notice, the wind is at its strongest at the eye wall. 00:03:22
But this is just a graph of air pressure and wind. 00:03:26
You also said that you collect data on temperature and moisture. 00:03:29
What would happen if we added that data to this graph? 00:03:32
Well, let's take a look. 00:03:34
Check it out. 00:03:39
The intensity of the temperature is really high in the eye of the hurricane. 00:03:41
And the moisture? 00:03:45
Well, it's at its lowest. 00:03:46
This sure is a lot of information, Valerie. 00:03:48
It is, and you know what? 00:03:50
A long time ago, weather geeks did not have this volume of information. 00:03:51
They would simply look at a hurricane, use their memory, and say, 00:03:56
hmm, this reminds me of Hurricane Baker 26 years ago. 00:03:59
They would then base their forecast for the current hurricane on what Hurricane Baker did way back then. 00:04:03
Today, the National Hurricane Center uses the data we collect from our flight 00:04:08
to feed their computer-generated models, or simulations, of hurricanes. 00:04:12
These computer-generated models forecast how conditions change in a hurricane over time. 00:04:16
Knowing what the storm is doing right now helps the National Hurricane Center 00:04:22
to predict the future path and intensity of the storm. 00:04:25
From this information, hurricane watches and warnings are sent out to people along the coast. 00:04:28
When people are evacuated to safer areas because of an impending hurricane, 00:04:33
then the mission of hurricane hunters contributes to saving lives. 00:04:37
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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:
575
Fecha:
28 de mayo de 2007 - 16:51
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
04′ 42″
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:
28.12 MBytes

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