Hurricanes.

Hurricanes size.


Hurricanes can be 1,000 miles in diameter. how to measure a hurricane is to measure the center of it to the outer most of it. If the radius is 138 miles then the hurricane is very small. A radius between 207 miles and 420 miles are considered average sized. If the radius is 552 then its very big hurricane.

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http://video.nationalgeographic.com/video/player/national-geographic-channel/shows/naked-science/ngc-hyper-hurricanes.html Video.

The eye of the hurricane...



The eye is the clam part of a hurricane the weather in the is not windy but nice and the sea is violent though.The eye is normally rounded and can be 1.9 miles long and wide. The eye wall is a circle of strong thunderstorms and high winds. That is what causes most of the damage by hurricanes. when the eye goes over land that is when all of the damage happened.
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Times of hurricanes...





In the north Atlantic ocean a hurricane occurs June 1 to November 30 sharply peaking from late Aug. Though September. Hurricane season is to September 10. The Northeast Pacific Ocean has the same broader period of activity. In the Southern Hemisphere, the hurricanes year begins in July 1 and it runs all year long.
Basin
Season start
Season end
Tropical Storm
(>34 knots)
Tropical Cyclones
(>63 knots)
Category 3+ T Cs
(>95 knots)
Northwest Pacific
April
January
26.7
16.9
8.5
South Indian
November
April
20.6
10.3
4.3
Northeast Pacific
May
November
16.3
9.0
4.1
North Atlantic
June
November
10.6
5.9
2.0
Australia Southwest Pacific
November
April
9
4.8
1.9
North Indian
April
December
5.4
2.2
0.4




Factors of hurricanes...



A hurricanes can cease to have tropical characteristics in several different ways.One such way is if it move's over land thus depriving it of the warm water it needs to power it self, losing more power, over land. Most strong storms lose their strength very rapidly after landfall then get weaker. Then disorganized areas of low pressure within a day or two, or evolve into extra tropical cyclones. That is the factors of hurricanes.
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Observation and forecasting...


Surface surveillance is generally available only to storm if it passes over a piece of land. Measurement are taken in the eye of the hurricane.Hurricanes that are far from land are tracked by satellites. Radar play a important role of showing the place of the hurricane. Some planes fly into the storm like the WC-130 and the WP-3D to get the measurements of the hurricane.

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File:Isidore091902-p3sunset.jpg



Tropical depression...


A tropical depression is an organized system of clouds and thunderstorms. The surface circulation and top speeds of the winds are 38 miles per hour. The storm has no eye in it. The storm is a low pressure system of clouds. They do not look like a hurricane but they have the power of one.



Effects...


Hurricane out at sea cause huge waves, heavy rain, and high winds. Strong winds damage and destroy vehicles, buildings, bridges, and other outside objects. A hurricane is more dangerous if the sea level is higher. over the past two centuries hurricanes have killed 1.9 million people. The flooding of hurricanes make standing water causing mosquito-borne illness at flooded places.

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Landfall...


Landfall is when a storms center crosses the coast line. A storms condition may get worst when it hits land. A hurricane loses power when it hits the land because of there is no water. A hurricane is bad at the coast line but when it is over land it gets weaker. It is very devastating.




Links


http://en.wikipedia.org/wiki/Hurricanes
http://www.fema.gov/kids/hurr.htm
http://teacher.scholastic.com/activities/wwatch/hurricanes/
http://www.miamisci.org/hurricane/