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Weather
By: Daniel Fisher, Matthew Demilio and Thad Flood
What is Weather
Weather is the current state of atmosphere, including short-term variations
such as temperature and precipitation
Basically the things that interact to affect the environment and earth's life
These things take place over seconds, minutes, hours or even sometimes days.
Climate
Weather over a long period of time is called climate
The definition of climate is the average temperature
over a period of time, usually being about 30 years or
more.
The study of all these terms is known as meteorology.
Global Winds
The atmosphere balances itself by acting as a giant heat-transferring system
It does this by moving warm air to the poles and cool air towards the equator
Global Winds Cont.
Trade winds - two belts of winds blowing from east to west
Westerlies -wind belts that dominate west to east of the
atmosphere (jet streams occurs here)
Polar easterlies -are the dry cold prevailing winds that blow
from the high pressure areas of the polar highs at the north
and south pole
The Types of Weather
There are many types of weather, these include things like:
Thunderstorms
Hurricanes
Tornados
Sleet
Hail
What Causes Weather?
Weather can change very fast, it can change in a matter of minutes.
It causes from the earth moving around the sun.
Because of the round shape of earth, the sun does not always directly hit it.
The sun hits the earth the most at the equator and the least at the poles.
This makes it very hot at the equator, and very cold at the poles.
Weather Maps
A weather map is a map that shows many
different meteorological features across a
particular area at a particular point in time. As
you can see, this graph has the weather, or the
symbol of it. The wind speed and the amount
of cloud cover
Weather Maps Cont.
Areas with an H have higher air pressure, and areas with an L are lower pressure areas.
Lower air pressure is usually associated with cloudy or stormy weather.
Air moves clockwise around higher pressure areas and counterclockwise around lower pressure
areas.
Blue lines with triangles are cold fronts, while red lines with half circles are warm fronts the
edges show which direction it is moving.
A line that mixes between the two is a stationary front.
A purple line with both shapes is an occluded front.
La Nina and El Nino
El Nino is a weather occurrence every few years in the pacific region.
El Nino causes a temperature change in the water and atmosphere
La Nina is the opposite, where the weather gets colder in a certain period of time.
La Nina is caused by a build-up of cooler-than-normal waters in the tropical Pacific, it
brings cold water to the surface caused by an upwelling.
Hurricanes
What causes a hurricane?
When water vapor condenses, it forms clouds
and rain.
This warms the surrounding rain causing a
hurricane
Tornadoes
What is a tornado?
A tornado is a revolving cone shaped vortex that picks up and destroys
things as it passes
What causes a tornado?
A tornado is caused by updrafts and downdrafts in the windshear,
creating a tornado vortex
What is a barometer
A barometer is a tool used for
measuring air pressure.