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Weather How Cold Will it be Tomorrow?

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Page 1: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

WeatherHow Cold Will it be

Tomorrow?

Page 2: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Heat Transfer

• As temperature rises, the energy within a molecule also increases

• Radiation-direct transfer of heat energy by electromagnetic waves

• Conduction- direct transfer of heat from one substance to another that it is touching (metals)

• Convection-heat is transferred through a gas or liquid (causes heating of atmosphere)

Page 3: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Heat Transfer - Conduction & Convection

Page 4: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Heat Transfer - Radiation

QuickTime™ and aSorenson Video decompressorare needed to see this picture.

Page 5: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Air Pressure• Increase elevation =

decreased air pressure– Air pressure drops 10 mm

for every 125 m rise

• Increased water vapor = decreased air press.– Water molecules are

lighter than other gases

• Increased temperature = decrease air press.– Increased temp=

molecules spread out

Page 6: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Earth’s Atmosphere

QuickTime™ and aSorenson Video 3 decompressorare needed to see this picture.

Page 7: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Barometer

• Barometer is the instrument that is used to measure air pressure

• High Pressure system brings nice weather.

• Low Pressure system brings precipitation and change in weather.

Page 8: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Air Fronts

• A front is a boundary between 2 air masses

• Cold front- forward edge of a cold air mass

• Warm front - forward edge of a warm air mass

• Stationary front- air masses that do not move

• Occluded front- a warm air front is trapped between two cold fronts

Page 9: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Fronts

QuickTime™ and aSorenson Video 3 decompressorare needed to see this picture.

Page 10: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Precipitation

• Precipitation occurs when water condenses

• Types of precipitation– Rain, snow, sleet,

hail, fog

Page 11: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Moisture - Water Cycle

QuickTime™ and aSorenson Video 3 decompressorare needed to see this picture.

Page 12: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Clouds

• Clouds form when water droplets and ice form around dust and other particles in air

• Types of Clouds-– Cumulus (big/puffy)– Stratus (flat, sheet-

like)– Cirrus (light/feathery)

Page 13: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Clouds

Page 14: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Dew Point

• Dew Point is the temperature at which condensation takes place - air becomes saturated

• As air cools, it cannot hold as much water

Page 15: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Humidity• Humidity- the amount of

water vapor in the air• High humidity = large

amounts of water in air (low= small amt)

• Air can hold more water when it is warm because the particles are further apart

• Saturated: when the air is full and cannot hold anymore water

Page 16: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Lake Effect Snow

• LES - occurs when land near Lake Erie and Lake Ontario freezes faster than the lakes (warmer air over water, cooler air over land)

• Usually occurs within 40 km of lake

Page 17: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Weather Maps

• Meterologists use computers and satellites to predict weather patterns

• Map symbols include:– Warm/cold fronts - Air pressure (isobars)– Wind speed/direction - Cloud cover symbols

Page 18: Weather How Cold Will it be Tomorrow? Heat Transfer As temperature rises, the energy within a molecule also increases Radiation-direct transfer of heat

Weather Prediction

QuickTime™ and aSorenson Video 3 decompressorare needed to see this picture.


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