4.1 weather and climate DCS 2015

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Weather & Climate

The Weather Forecast!:

The Weather Forecast! Most people watch the weather forecast everyday – but do we really know how they gather all the information?! Satellite Weather Balloon Weather Station

What is weather?:

What is weather? WEATHER is: the hour to hour, day to day change in the atmosphere.

What is climate?:

What is climate? CLIMATE is: the average weather conditions of a place taken over a long time.

Global temperatures:

Global temperatures What do you notice about all the places along the dotted line? The further in land you go the hotter it gets in the Summer and the colder it gets in the Winter!

Showing differences in temperature. :

Showing differences in temperature. Temperatures are shown using isotherms . These lines join up places with the same temperature. Once all the places of similar temperatures are joined together and shaded in a map like this is created!

Relief rainfall:

Relief rainfall Sea High land forces the air upwards where it cools and the water vapour condenses forming clouds. This in turn causes rain! Warm, moist air blows in from the Atlantic

Relief rainfall:

Relief rainfall Sea High land forces the air upwards where it cools and the water vapour condenses forming clouds. This in turn causes rain! Warm, moist air blows in from the Atlantic

Convectional rainfall:

Convectional rainfall 1. The sun heats the ground. 2. The hot ground heats the lowest air and the water from the ground is evaporated. 3. Water vapor rapidly rises, cools and condenses.

Why are some areas hotter than others?:

Why are some areas hotter than others? Polar areas are cold because the suns rays hit the earth at a slant so the sun’s energy is less concentrated. Tropical areas are hot because the suns rays hit the earth at right angles near the equator – so the sun’s energy is concentrated. Sun’s energy

Why do we get seasons?:

Why do we get seasons? Equator Equator S N N N S N S S SUN DECEMBER The Sun is overhead at the Tropic of Capricorn, 23½ºS JULY The Sun is overhead at the Tropic of Cancer, 23½ºN MARCH The Sun is overhead at the Equator. SEPTEMBER The Sun is overhead at the Equator. Spring Spring Autumn Autumn Summer Winter Equator TRopic of Capricorn Summer Tropic of Cancer Winter Equator

Climate Graphs. :

Climate Graphs. Climate graphs show two different things – average monthly rainfall & average monthly temperatures . How do you draw a climate graph?

TV symbol meanings:

TV symbol meanings

Synoptic chart symbols:

Synoptic chart symbols Mist Fog Thunder Drizzle Rain Snow Hail Shower Heavy rain Heavy snow

Air Masses:

Air Masses An air mass is a large ‘parcel’ of air that has certain characteristics, depending on where they originally came from.

Weather Data:

Weather Data

Drawing a climate graph. :

Drawing a climate graph. Months Temperature ( °C) Rainfall (mm) A bar-chart is drawn to show the average monthly rainfall. A line graph is then added to show average monthly temperatures.

Draw a climate graph!:

Draw a climate graph! The person nearest the window is to draw the climate graph for Inverness – the person nearest the door is to draw the climate graph for Stornoway!

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