John is a fan of the great outdoors and when the skies aren't stormy you'll find John with fishing rod in hand, headed for his favorite spot to toss out a line. He and his family are avid campers as well.
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What is a hurricane?
A hurricane is a type of tropical cyclone (the general term for all circulating weather systems which form over tropical waters.)
Tropical cyclones are classified as follows:
Tropical Storm: An organized system of strong thunderstorms with a defined circulation and maximum sustained winds of 39 to 73 mph (34-63 knots).
Hurricane: An intense tropical weather system with a well defined circulation and maximum sustained winds of 74 mph (64 knots) or higher. In the western Pacific, hurricanes are called "typhoons," and similar storms in the Indian Ocean are called "cyclones."
Tropical cyclones are classified according to the Saffir-Simpson Scale.
Hurricanes are products of the tropical ocean and atmosphere. They are powered by heat from the sea, and they are steered by the easterly trade winds and the temperate westerlies as well as by their own energy. Around their core, winds grow with great velocity, generating violent seas.
Developing hurricanes gather heat and energy through contact with warm ocean waters. The addition of moisture by evaporation from the sea surface powers them like giant heat engines
Moving ashore, they sweep the ocean inward while spawning tornadoes and producing torrential rains and floods.
Where and when do hurricanes usually form?
In the eastern Pacific, hurricanes begin forming by mid-May
In the Atlantic, Caribbean, and Gulf of Mexico, hurricane development starts in June.
For the United States, the peak hurricane threat exists from mid-August to late October although the official hurricane season extends through November.
Over other parts of the world, such as the western Pacific, hurricanes can occur year-round.
Each year on average, ten tropical storms (of which six become hurricanes) develop over the Atlantic Ocean, Caribbean Sea, or Gulf of Mexico. Many of these remain over the ocean. However, about five hurricanes strike the United States coastline every 3 years. Of these five, two will be major hurricanes (category 3 or greater on the Saffir-Simpson Hurricane Scale).
What are some of the hazards associated with hurricanes?
Storm surge is a large dome of water often 50 to 100 miles wide that sweeps across the coastline near where a hurricane makes landfall. The surge of high water topped by waves is devastating. The stronger the hurricane and the shallower the offshore water, the higher the surge will be. Along the immediate coast, storm surge is the greatest threat to life and property.
The storm tide is the combination of the storm surge and the normal astronomical tide. If the storm surge arrives at the same time as the high tide, the water height will be even greater.
Hurricane-force winds, 74 mph or more, can destroy poorly constructed buildings and mobile homes. Debris, such as signs, roofing material, siding, and small items left outside, become flying missiles in hurricanes. Winds often stay above hurricane strength well inland.
Widespread torrential rains often in excess of 6 inches can produce deadly and destructive floods. This is the major threat to areas well inland.
Hurricanes also produce tornadoes, which add to the hurricane's destructive power. These tornadoes most often occur in thunderstorms embedded in rain bands well away from the center of the hurricane. However, they can also occur near the eyewall.
What areas are most likely to be hit by a Hurricane?
All Atlantic and Gulf coastal areas are subject to hurricanes or tropical storms. Although rarely directly struck by hurricanes, parts of the Southwest United States and Pacific Coast suffer heavy rain and floods each year from the remnants of hurricanes spawned off Mexico.
Islands, such as Hawaii, Guam, American Samoa, and Puerto Rico, are also subject to hurricanes. Due to the limited number of evacuation routes, barrier islands are especially vulnerable to hurricanes.