Presentation1

Weather and Climate

By: Tyler Laurain

7th grade science standards

E.ES.07.72- Describe how different weather occurs due to the constant motion from the atmosphere.

E.ES.07.74- Describe weather conditions associated with frontal boundaries and movement of major air masses and the jet stream across North America using a weather map.

WeatherCondition of the air on earth

The sun determines our weather

Water evaporates into the air

Causes our air to rise

Fronts and Air Masses

Air MassesLarge body of air

Have similar properties

Can be tracked over time

Gives us clues to future weather

Air MassesDifferent air masses don’t usually mix

Boundary, or front, forms between masses

Stormy weather often occurs along fronts

Cold FrontsCold air moves into warm air

The cold air becomes more dense

Pushed under warm air

Cumulus clouds and showers occur

Winds change directions, temperature drops

Warm FrontsWarm air moves into cold air

Pushed above cold air

Cirrus and possibly stratus clouds form

Some participation, rain or snow

Air pressure and temperature rise

Stationary FrontSometimes air masses don’t

move

Variety of weather occurs

Usually clouds with light precipitation

Dissipate after several days

QuestionsWhat is an air mass?

What happens in a cold front?

High Pressure Area’sShown by “H” symbols

Pressure is greater then surrounding areas

Air pressure difference results in wind

Low Pressure Area’sShown by “L” symbols

Winds blow into low pressure zones

Incoming winds cause clouds and precipitation

Using a Weather MapRed arrows are warm fronts

Blue arrows are cold fronts

“H” high pressure zones

“L” low pressure zones

Weather Map

Predicting WeatherMeteorologists monitor weather

conditions

Sample wide network of weather stations

Satellite images

Predicting WeatherPredict with great deal of

accuracy

Weather moves from west to east

Geographic conditions can affect local weather

CreditsAxel Rouvin, CG lightning strike,

January 18th 2007, Attribution

NOAA, Weather Map, December 14th 2003, Public Domain