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Fronts & Storms by Mrs. Wisher WRITE EVERYTHING IN GREEN

Fronts & Storms

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Fronts & Storms. by Mrs. Wisher WRITE EVERYTHING IN GREEN. Air Masses. air mass – a huge body of air that has similar temperature, humidity, and air pressure throughout maritime air masses forms over oceans continental air masses form over land - PowerPoint PPT Presentation

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Page 1: Fronts & Storms

Fronts & Storms

by Mrs. Wisher

WRITE EVERYTHING IN GREEN

Page 2: Fronts & Storms

Air Masses

• air mass – a huge body of air that has similar temperature, humidity, and air pressure throughout

• maritime air masses forms over oceans• continental air masses form over land• polar air masses form in cold regions and

tropical air masses form in warm areas

Page 3: Fronts & Storms

Fronts

• Fronts occur when 2 air masses meet but do not mix

• When fronts combine they often cause storms or changes in weather

Page 4: Fronts & Storms

Cold Fronts

• cold fronts – when a fast moving cold air mass runs into a slow moving war air mass, the cold dense air slides underneath

• cold fronts cause cloudy skies with possible heavy rain or thunderstorms & colder temperatures

Page 5: Fronts & Storms

Warm Fronts

• a moving warm air mass collides with a slow moving cold air mass

• weather can be humid or dry but will be warmer

warm air

cold air

Page 6: Fronts & Storms

Stationary Fronts

• When a cold and warm air mass meet but do not have the force to move each other

• Weather can be cloudy or rainy for an extended period of time.

Page 7: Fronts & Storms

Occluded Front

• Occurs when a warm air mass is trapped between 2 cold air masses

• This pushes the warm air mass upwards and the temperature cools

Page 8: Fronts & Storms

Storms

• storm – a violent disturbance in the atmosphere • usually cause changes in air pressure

Page 9: Fronts & Storms

Thunderstorms• Thunderstorms form within large cumulonimbus cloud• lightning – a sudden energy discharge from a cloud to another cloud

or the ground• thunder – the sound produced by the rapid heating of the air after a

lightning strike

Page 10: Fronts & Storms

Tornados

• Tornados are funnel shaped clouds with rotating speeds of up to 480 km per hour

• They form in the same cumulonimbus clouds as thunderstorms

• Most tornados form in the Great Plains which is known as Tornado Alley.

tornado images

Page 11: Fronts & Storms

Hurricanes

• A tropical storm with winds higher than 119 km per hour

• Hurricanes begin over warm water as a tropical disturbance

Page 12: Fronts & Storms

Blizzard

• A snowstorm with high speed sustained winds.

• Wind speeds over 35 miles per hour and lasts at least 3 hours.

Page 13: Fronts & Storms

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