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THE SCIENCE OF WEATHER: HURRICANES

// June 2nd, 2010 // Comments Off on THE SCIENCE OF WEATHER: HURRICANES // Discover More

We’ve learned about various forms of weather, everything from blizzards to tornadoes. Now let’s take a look at one of its most extreme manifestations, the tropical cyclone, or a hurricane, as it’s most commonly called. It’s hurricanes that can wreak havoc on lives with the floods, tornados and wind damage that ensue during and after the storm. So lets find out a little more about hurricanes.

What exactly is a hurricane?

A hurricane is a huge storm that can span 600 miles across and have strong winds ranging from 74-200 miles per hour (mph). The storms are usually a weeklong and form in the southern Atlantic Ocean, Caribbean Sea, Gulf of Mexico, and in the eastern Pacific Ocean. They move 10-20 mph over the open ocean. With them, these storms usually bring rain, thunder and lightening. Once on land, the heavy rain, strong winds and large waves can have a damaging affect on buildings, cars, and trees. Not to mention the devastating impact hurricanes leave on people.

How do hurricanes form?

Hurricanes form over ocean water of 80°F or warmer and it’s from these warm ocean waters that hurricanes gather their heat and energy. They also require the influence of the Earth’s rotation to initiate a spinning circulation called the Coriolis Effect. Evaporation from the seawater increases their power. Once formed, a hurricane rotates in a counter-clockwise direction around an “eye.” As the center of the hurricane, the “eye” is the calmest part, with only light winds and fair weather.

What’s the difference between a typhoon and a hurricane?

Typhoons and hurricanes are essentially the same thing, a strong tropical cyclone. The difference, however, lies in where they form. For example, a tropical cyclone that originates in the North Pacific Ocean west of the International Dateline is known as a typhoon. Yet a tropical cyclone that forms in the North Atlantic and Northeast Pacific Oceans east of the International Dateline or South Pacific Ocean east of 160E is considered a hurricane.

What’s the International Dateline? Well, it’s an imaginary line set approximately along the 180th meridian designated as the place where each calendar day begins. Click here to find out about this interesting time line!

When is hurricane season?

The Atlantic hurricane season runs from June 1 to November 30. But don’t be too fast to rule out all the other months, as hurricanes have occurred outside this six-month window. What this does mean is that the months that make up hurricane season include over 97 percent of tropical activity. For decades, June 1st has been the official kick off for the Atlantic hurricane season, however, the same can’t be said for November 30th as the end date. Hurricane season’s designated end date has shifted from October 31st to November 15th until the current date of November 30th.

The season does seem to peak from August through October. In fact, 78 percent of the tropical storm days, 87 percent of the minor (Categories 1-2) hurricane days, and 96 percent of the major (Categories 3-5) hurricane days occur during this time. Yet, maximum activity occurs in early to mid September. (Hurricane Research Division)

How are hurricanes ranked?

The United States utilizes the Saffir-Simpson hurricane intensity scale to rank Atlantic hurricanes. This scale gives an estimate of the potential flooding and damage to property given a hurricane’s estimated intensity. Take a look at the chart below to see hurricane categories and some examples.

CATEGORY

WINDS

(MPH)

SURGE

(Feet)

DAMAGE

EXAMPLE

1

74-95

3-5

Minimal

Hurricane Earl (1998)

2

96-110

6-8

Moderate

Hurricane Georges

(1998)

3

111-130

9-12

Extensive

Hurricane Fran

(1998)

4

131-155

13-18

Extreme

Hurricane Hazel (1954)

5

155+

>18

Catastrophic

Hurricane Camille (1969)

How do I know that a hurricane is headed my way?

Well, look out for two key terms on radio and television, hurricane watch and hurricane warning. If you keep your ear open for these two words than you will know if a hurricane is on track for your area.

More specifically, when the forecast calls for a Hurricane Watch, it means a hurricane is possible within 36 hours. In this case, stick close to the radio and TV so you’ll know the latest information. Be assured that the Hurricane Center is tracking the storm and trying to predict where the storm may come ashore.

However, if you hear the words Hurricane Warning, then a hurricane is expected within 24 hours. In this case, you may be told to evacuate. This is the time that you and your family should discuss preparations, such as getting grocery supplies, gassing up vehicles, boarding windows, and/or making plans for pets in the event you have to leave.

Why do hurricanes have names?

Well why does anything have a name? Think of how hard it would be to communicate with others if you didn’t use names. Hurricanes are no different, that’s why all of them have names. Naming the hurricanes is essential to establishing good communication between the public and the meteorologists who watch the storms; making it easier for them to alert you about forecasts, watches, and warning. Hurricanes can often last a week or longer, and there can be more than one at a time. Without names it would be pretty confusing to decipher which storm is being described.

The actual naming of hurricanes has an interesting history. In the early 20th century an Australian forecaster assigned the first proper name of a tropical cyclone, using politicians he disliked as a naming source. Then during World War II, hurricanes were informally given female names by the US Army Corp and Navy meteorologists who were monitoring tropical cyclones over the Pacific. However, from 1950 to 1952 tropical cyclones occurring in the North Atlantic Ocean were named using the phonetic alphabet. Then in 1953 the US Weather Bureau (now known as the National Weather Service) began using female names for storms. In 1979, the World Meteorological Organization (WMO) and the NWS switched practices to include the use of both male and female names for tropical cyclones.

The WMO uses the names on six lists, where each name corresponds to a letter of the alphabet. But, if you look at the lists you’ll see that the letters: Q, U, X, Y, and Z were excluded from the lists due to the lack of names beginning with those letters. The lists are reused every six years. Some hurricane names are retired if the storm has been very deadly or costly; in that case the WMO adds a new name to the list.

Sources:

NOAA

Ready Kids

SC State Climatology Office

National Hurricane Center

Weather Wiz Kids

THE SCIENCE OF WEATHER: TORNADOES

// April 21st, 2010 // Comments Off on THE SCIENCE OF WEATHER: TORNADOES // Discover More

From “Twister” to “The Wizard of Oz,” there have been many movies that feature the whirling tornado. But how much do we know about this fast and furious force of nature? Join in as we discover the ins and outs of the tornado.

Tornadoes are born out of a powerful thunderstorm (a storm with thunder and lightening), called a supercell. A supercell can last longer than a normal thunderstorm. The same trait that’s responsible for the storm’s longer duration also creates most tornadoes. Wind coming into the storm starts to swirl and forms a funnel. The air inside the funnel spins so fast it pulls in more air—and objects. The funnel begins to act like a vacuum cleaner, sucking up everything in its path.

Click here to see how tornadoes form!

Tornadoes occur most frequently in the United States, with an average of 800 reported each year. They require an unstable atmosphere and form where cold dry polar air meets warm moist tropical air. This occurs most often in the Great Plains of the United States, which is why it’s called Tornado Alley. Tornadoes come in all shapes and sizes, and can happen at any time. It’s their quick formation that can make them especially dangerous.

Did you know. . .?

  • Tornadoes are rated on a scale of 0 to 5.
  • Tornadoes can be deadly. Some can have winds over 300 miles an hour—that’s enough to lift houses off the ground and bark off the trees!
  • Tornadoes can damage an area one mile wide and 50 miles long.
  • While tornadoes can happen at any time of the year, they typically occur from March-August.
  • The air pressure is very low inside the funnel, just like pressure is low inside the eye of a hurricane. Only in a tornado, the pressure is a lot lower—lower than any other place on earth.

Important Terms To Know:

Tornado Watch—Tornadoes are possible. Stay tuned to the radio or television news.

Tornado Warning—A tornado has been sighted. Take shelter immediately!

Now that you know a little more about tornadoes, go make one in a jar. Click to find out how!

Sources

http://www.windows.ucar.edu/

http://www.fema.gov/kids/tornado.htm

http://www.weatherwizkids.com/weather-tornado.htm

http://www.nationalgeographic.com/xpeditions/lessons/15/gk2/tornadowhat.html

Photo Credit: Sean Waugh NOAA/NSSL



The Science of Weather

// May 27th, 2009 // Comments Off on The Science of Weather // Discover More


Do you know what this is? Read below to find out!

We experience weather everyday, but do we really know what it means? In its basic sense, weather is the state of the atmosphere at any given time with respect to wind, temperature, cloudiness, moisture and pressure. Floods, thunderstorms, and hurricanes are a few extreme manifestations of weather. Do you know any others? Click here to learn more weather related terms.

Weather plays an important role in our daily lives and one of the first things many of us do in the morning is check the weather. Some may search the newspaper or television for the day’s forecast, while others may make observations by peeking out doors or windows. Why do we do this? Well, weather determines what we wear, what we do, and where we go. More importantly, knowing what to do in the case of extreme weather can save our lives. That’s why meteorology is so important. By definition, meteorology is a type of science that deals with atmosphere and its phenomena, especially with weather and its forecasting. Generally, the person you see on the news delivering the weather forecast is a meteorologist. There are many other career options in the field of meteorology, such as a climatologist or a radar meteorologist. In addition, a career in meteorology could lead to job opportunities at NASA, the National Weather Service or the military.

Now that we know a little more about weather, lets talk about one of its most extreme manifestations, the tropical cyclone, or a hurricane, as it’s most commonly called. It’s hurricanes that can wreak havoc on lives with the floods, tornados, and wind damage that happen during and after the storm. So lets find out a little more about hurricanes.


Credit: Peter Dodge, AOML Hurricane Research Division

What exactly is a hurricane?

A hurricane is a huge storm that can span 600 miles across and have strong winds ranging from 74-200 miles per hour (mph). The storms are usually a weeklong and form in the southern Atlantic Ocean, Caribbean Sea, Gulf of Mexico, and in the eastern Pacific Ocean. They move 10-20 mph over the open ocean. With them, these storms usually bring rain, thunder, and lightening. Once on land, the heavy rain, strong winds, and large waves can have a damaging affect on buildings, cars, and trees. Not to mention the devastating impact hurricanes leave on people.

Here are pictures of homes at Folly Beach, SC before (left) and after (right) Hurricane Hugo.

                  

Credit: National Hurricane Center

How do hurricanes form?

Hurricanes form over ocean water of 80°F or warmer and it’s from these warm ocean waters that hurricanes gather their heat and energy. They also require the influence of the Earth’s rotation to initiate a spinning circulation called the Coriolis Effect. Evaporation from the seawater increases their power. Once formed, a hurricane rotates in a counter-clockwise direction around an “eye.” As the center of the hurricane, the “eye” is the calmest part, with only light winds and fair weather.

Now that you know how a hurricane forms, let’s see how you do with creating one.

Create-A-Cane

Hurricane Maker

What’s the difference between a typhoon and a hurricane?

Typhoons and hurricanes are essentially the same thing, a strong tropical cyclone. The difference, however, lies in where they form. For example, a tropical cyclone that originates in the North Pacific Ocean west of the International Dateline is known as a typhoon. Yet a tropical cyclone that forms in the North Atlantic Ocean, the Northeast Pacific Ocean east of the International Dateline or the South Pacific Ocean east of 160E is considered a hurricane.

What’s the International Dateline? Well, it’s an imaginary line set approximately along the 180th meridian, designated as the place where each calendar day begins. Click here to find out about this interesting time line!

When is hurricane season?

The Atlantic hurricane season runs from June 1 to November 30. But don’t be too fast to rule out all the other months, as hurricanes have occurred outside this six-month window. What this does mean is that the months that make up hurricane season include over 97 percent of tropical activity. For decades, June 1st has been the official kick off for the Atlantic hurricane season, however, the same can’t be said for November 30th as the end date. Hurricane season’s designated end date has shifted from October 31st to November 15th until the current date of November 30th.

The season does seem to peak from August through October. In fact, 78 percent of the tropical storm days, 87 percent of the minor (Categories 1-2) hurricane days, and 96 percent of the major (Categories 3-5) hurricane days occur during this time. Yet, maximum activity occurs in early to mid September. 

How are hurricanes ranked?

The United States utilizes the Saffir-Simpson hurricane intensity scale to rank Atlantic hurricanes. This scale gives an estimate of the potential flooding and damage to property given a hurricane’s estimated intensity. Take a look at the chart below to see hurricane categories and some examples. 

Why do hurricanes have names?

Credit: NOOA/Department of Commerce

Well why does anything have a name? Think of how hard it would be to communicate with others if you didn’t use names. Hurricanes are no different, that’s why all of them have names. Naming the hurricanes is essential to establishing good communication between the public and the meteorologists who watch the storms; making it easier for them to alert you about forecasts, watches, and warning. Hurricanes can often last a week or longer, and there can be more than one at a time. Without names it would be pretty confusing to decipher which storm is being described.

The actual naming of hurricanes has an interesting history. In the early 20th century an Australian forecaster assigned the first proper name of a tropical cyclone, using politicians he disliked as a naming source. Then during World War II, hurricanes were informally given female names by the US Army Corp and Navy meteorologists who were monitoring tropical cyclones over the Pacific. However, from 1950 to 1952 tropical cyclones occurring in the North Atlantic Ocean were named using the phonetic alphabet. Then in 1953 the US Weather Bureau (now known as the National Weather Service) began using female names for storms. In 1979, the World Meteorological Organization (WMO) and the NWS switched practices to include the use of both male and female names for tropical cyclones.

The WMO uses the names on six lists, where each name corresponds to a letter of the alphabet. See the lists here. But, if you look at the lists you’ll see that the letters: Q, U, X, Y, and Z were excluded from the lists due to the lack of names beginning with those letters. The lists are reused every six years. Some hurricane names are retired if the storm has been very deadly or costly; in that case the WMO adds a new name to the list.

How do I know that a hurricane is headed my way?

Well, look out for two key terms on radio and television, hurricane watch and hurricane warning. If you keep your ear open for these two words than you will know if a hurricane is on track for your area.

More specifically, when the forecast calls for a Hurricane Watch, it means a hurricane is possible within 36 hours. In this case, stick close to the radio and TV so you’ll know the latest information. Be assured that the Hurricane Center is tracking the storm and trying to predict where the storm may come ashore.

However, if you hear the words Hurricane Warning, then a hurricane is expected within 24 hours. In this case, you may be told to evacuate. This is the time that you and your family should discuss preparations, such as getting grocery supplies, gassing up vehicles, boarding windows, and/or making plans for pets in the event you have to leave.

Check out this link to download a hurricane tracking map and to learn more on how to prepare for a hurricane.

Sources:

NOAA

FEMA For Kids

SC State Climatology Office

National Hurricane Center

Weather Whiz Kids

November is National American Indian Heritage Month!

// November 12th, 2007 // Comments Off on November is National American Indian Heritage Month! // Discover More

Today, there are over 500 different federally recognized Native American Tribes in the Americas. These tribes represent groups of people with distinct cultural backgrounds, languages, customs and histories. Today, Native people live modern lives, but many still practice their traditional customs. For example, Native people might also speak their Native language in addition to English, practice traditional religion, and wear regalia or special clothes, for important occasions.

Native people have called the Americas “home” for thousands of years, long before Europeans arrived. So, how do scientists learn how they lived thousands of years ago, before there were written records? They use archeology! Archeology represents one way to learn how Native people lived in the past. Archaeologists study how people lived long ago by examining the things they left behind- artifacts, or objects made or used by people. Artifacts provide clues about the people who made them and the time in which they lived.

Click below to learn about some of the Native people of South Carolina, today and in the past.

Catawba Tribe

Cherokees of South Carolina