Hurricanes Arianna and Ella Song

What are hurricanes?

Hurricanes are huge, violent storms that can be around 600 miles across. The winds of a hurricane moves inwards and upwards and its speed can reach up to 200 mph.

The Structure of a Hurricane

This diagram shows the structure of a hurricane in the Northern Hemisphere. It explains how the wind flows upwards and flows outwards, (warm air rising/cold air falling). It also shows the parts of the hurricane.
This diagram shows the pressure and the wind speed within the eye and the eyewall. In the eyewall, the wind speed reaches its maximum but in the eye, the winds become light or calm. And the pressure starts to fall more quickly while the wind speed, at the same time, increases.

How are they formed?

Hurricanes form only above oceans with warm water, 80 degrees Fahrenheit or warmer. This is because the warm water releases heat and energy that causes hurricanes to form. It causes more evaporation which provides humid air and storm clouds. The wind/speed should be blowing in the same direction so the air will be forced upwards from the ocean surface. Then the winds flow outwards above the storm cloud so that the air below the cloud can rise.

This is a diagram showing how a tornado is formed. As it is written, it says that hurricanes need warm ocean water to form a hurricane because it provides energy and heat. Then the winds from around the area comes together which forces it upwards. After that the winds flow above the storm and outwards. The humid air that is rising upwards causes the clouds to turn into a storm.

This is another video about hurricanes, and this one shows the destruction and the damage the hurricane caused during the storm. Almost everything was destroyed and big materials collapsed and bits of other materials were flying everywhere. At the end of the video, the roof of a house ripped off completely.

Rotations of hurricanes

The hurricane's wind rotates in the direction, counter-clockwise around the "eye" of the storm. The center of the storm is the calmest part which is called the "eye". Storms that rotate anti-clockwise is the tropical storm which occurs only in the Northern Hemisphere. The storms that occur in the Southern Hemisphere rotates in a clockwise direction.

This diagram shows the direction in which the air and the deflection moves. The hurricane that rotates clockwise and the one that moves counterclockwise both moves in a different direction, (the direction of air and deflection).

Tropical Storms

Tropical storms are hurricanes that are located in a different part of the world. There are three different names for tropical storms. Storms that occur in the Atlantic Ocean, in the Gulf of Mexico, and in the Eastern Pacific Ocean. They are all hurricanes.


Typhoons are hurricanes that are located in different part of the ocean. Typhoons occur in the Western Pacific Ocean and they can be very dangerous if it hits China. This is because of its high population density.

This picture shows the hurricane/cyclone/typhoon and it shows how each ones are different.


Cyclones are hurricanes too but they form above the Indian Ocean, in the Bay of Bengal and in Australia. They rotate around the low pressure zone which is the center of the storm. There are four different stages of a cyclone. The first one is called the tropical cyclone. It is when the low pressure occurs at the same time as the convective clouds. Then the surface winds becomes stronger and it enters the early stage. The second stage is called the tropical depression. This is when the low pressure area occurs with thunderstorms and this makes a circular wind flow. The third stage is the tropical storm. It forms when the winds are in the maximum stage. Then it becomes a hurricane with a circular shape. The last stage is the hurricane and it is formed when the surface pressures' temperature gets colder and when the wind speeds up and it also rotates around the "eye".

The first stage
The second stage
The third stage
The last stage which is the hurricane itself.
This is a map of the world showing the areas of where the storms occurred. The hurricanes went around the western area, the cyclones/typhoons went through the eastern area.
This is another map showing where tropical storms are formed and the typical path of the storm. We decided to add this picture since we learned this in geography class. So we thought this would show a good understanding of the storms and the path they rotate in.

Hurricane seasons

There are different hurricanes that occur in different types of oceans so the hurricane seasons come at different months for different types of hurricanes. The Atlantic hurricane season starts from June 1 to November 30 and the Eastern Hurricane season is from May 15 to November 30. However, most hurricanes start during the fall months.

The beginning of June and during fall months are when the hurricanes are formed more often. This graph shows, during which months the hurricanes are most active all around the world.

Where is the most destructive part of the tornado?

The most destructive part of a tornado is the eyewall. This is located outside of the eye. This is the place where the most damaging winds occur. The convergence, which is the condition when the air is forced to rise upwards, at the eye of the wall, lifts the air very quickly and is the strongest force.

This graph shows the number of storms per 100 years. It shows the number of hurricanes/tropical storms that occurred during the months that are shown. During September, the number of storms were the greatest.
This graph shows major hurricanes that struck the United States every ten years. During 1941-1950, that was the year with the most number of hurricanes, 10. The least was only one time during 1861 to 1870 which was 9 years.

This is a video showing all about hurricanes and how it's formed and also how it looks like and what damage it can do, (almost everything that was mentioned in this presentation). Also, this video sums up our hurricane project, so we thought this was perfect.

Sources: (picture/diagrams/graphs/videos/maps) (video) (hurricane structure) (Rotation) (vs) (graph) (diagram)*&imgrc=3G5175CaW1JjSM (map)*&imgrc=nNKdogvsfEh31M (map) (video)*&imgrc=lxgFs_2hThUgHM (graph)

Source: (info)


Created with images by janeb13 - "tropical cyclone catarina march 26th 2004 cyclone"

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