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| A Whirl-Wind Guide to Hurricanes |
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What are Hurricanes? Do not Panic, Hurricanes are trackable and predicted paths are now very accurate A hurricane is a massive storm with super heavy winds. By definition, they contain winds in excess of 74 miles per hour up to 186 miles per hour and can be up to 600 miles across with the strong winds spiraling inward and upward. Hurricanes rotate in an anti or counter-clockwise direction around the peaceful center called the “eye”. If you ever look on a satellite image the eye is usually quite easy to spot. The eye can stretch from 10 – 30 miles wide and often contains light winds and clear skies. This is where the Hurricane Hunters fly into to take readings and images. All around the eye is a mad frenzy of winds blasting away up to 186 miles per hour. To give you an idea of the force and power a hurricane can generate check this out…..If once percent of the energy in just one hurricane could be used or captured, then all the power, fuel and heating requirements for the whole of the Untied States of America could be met for one year! To quote “It takes 500 trillion horsepower to whirl the great core of winds at such tremendous speeds. It is the equivalent of exploding an atomic bomb every 10 seconds” (Lockhart,1988). How are Hurricanes formed? Hurricanes begin as tropical storms over the warm moist waters of the Atlantic and Pacific oceans which are near to the equator. Hurricanes will only ever form over warm ocean waters (above 79F). The atmosphere (air) must cool off quickly the higher you go, the wind must be blowing in the same direction and at the same speed to enable the air to be forced upwards from the ocean surface. The moisture continues to rise until enormous amounts of heated air are twisted high into the atmosphere. The winds commence circling in an anti-counter clockwise direction north of the equator and in a clockwise direction south of the equator (here hurricanes are known as typhoons). As long as the hurricane stays over warm waters it will continue to pull in moisture from the ocean surface and grow in size and force. When a hurricane hits land or crosses over cooler waters it will lose it’s source of power and the winds will gradually slow until they are no longer of hurricane strength – in other words less than 74 miles per hour. Hurricanes over the Atlantic often commence near Africa and drift in a westerly direction on the Trade Winds, they usually will veer off in a northerly direction as they meet the prevailing winds which are coming in from the east across North America. The Coriolis Force is needed to create the spin in the hurricane and it becomes too weak near the equator so that is why hurricanes are never formed there. What is the difference between a hurricane, a typhoon and a cyclone? .......Nothing really – except geography! Hurricanes typically form between 5 to 15 degrees latitude north and south of the equator. When does Hurricane Season Start and Finish? Most hurricanes occur during fall/autumn months however the official dates for hurricane season in the Atlantic is from June 1st to November 30th. Hurricane Names Before 1953 hurricanes were identified by using their latitude and longitude positioning, not only was this a mouthful to say all the time but subject to error too when relaying this information to coast guards, ships at sea and weather stations.
Please note: names are provided from information given from: National Weather Service, National Hurricane Center, Tropical Prediction Center. (NOAA). Hurricane Hunters Is it a bird? Is it a plane? No it’s the crazy and brave “hurricane hunters” who work for the National Oceanic and Atmospheric Administration (NOAA). The planes carry the crew four to six times through the storm and each mission will last around ten hours. Inside the plane there is super sophisticated equipment from radar reading, weather instruments to determine temperature, air pressure, wind speed and direction inside the hurricane. The crew at different levels will also release instruments that measure the temperature, air pressure and wind through the hurricane towards the ocean. The devices will relay back vital information to people waiting at ground level to collate all this information. Hurricane Stages are as follows
What to do if a hurricane is approaching If you are on vacation and a hurricane is approaching this is the information you will be given by your tour representatives and hotels. It is vitally important to listen to the information and if you are asked to leave your rooms and move to a safer area it is imperative that you do so in a calm and reasonable manner. Hurricanes sound exciting but in reality they are dangerous weather forces that can cause catastrophic damage.
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