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Weather Fronts.

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Presentation on theme: "Weather Fronts."— Presentation transcript:

1 Weather Fronts

2 Target #15- I can describe a weather front
When two unlike air masses meet, density difference usually keep the air masses separate. Cool air masses are denser than warm air masses Their interaction is called a front Can be several hundred to several thousand kilometers long Initiates weather activity

3 Target #16- I can state how a front forms
For a front to form one air mass must collide with another air mass Kind of front determined by how the masses move in relationship to each other Target #16- I can state how a front forms

4 Cold Front: occurs when a cold air mass overtakes a warm air mass
Target #17- I can differentiate between the types of weather fronts that can form Cold Front: occurs when a cold air mass overtakes a warm air mass The cold air lifts the warm air mass If the warm air is moist, clouds will form The faster the front moves the stronger the storms Squall line: where thunderstorms form along a fast moving cold front


6 Warm Front: occurs when a warm air mass overtakes a cold air mass
Less dense warm air rises over the cooler air Generally produces precipitation over a large area May cause violent weather


8 Stationary Front: occurs when two air masses meet, but neither displaces the other
Either moves slowly or not at all Weather produced is similar to a warm front

9 Occluded Front: occurs when a fast-moving cold front overtakes a warm front and lifts the warm air off the ground completely Usually results in rain storms

10 Target #18- I can describe a mid-latitude cyclone
Mid-latitude cyclones A wave forms at the boundary where cold polar air meets tropical air Usually occurs in the mid-latutides (half way between the equator and the poles) Hurricanes: Over oceans Tornadoes: Over land Illustrated by a counter-clockwise rotation of air Target #18- I can describe a mid-latitude cyclone

11 Target #19- I can state how a mid-latitude cyclone forms


13 Target #20- I can describe hurricanes
a tropical storm that forms over a warm ocean has strong wind speeds of more than 120 km/h spirals toward its intense low pressure center Begins when warm, moist air over the ocean rises rapidly Winds increase toward the center (the eye) Causes a storm surge rising sea level Target #20- I can describe hurricanes

14 Target #21- I can summarize the impact a hurricane induced storm surge has on the environment
Storm surges are frequently the most devastating element of a hurricane. As a hurricane’s winds spiral around and around the storm, they push water into a mound at the storm’s center. This mound of water becomes dangerous when the storm reaches land because it causes flooding along the coast. The water piles up, unable to escape anywhere but on land as the storm carries it landward. A hurricane will cause more storm surge in areas where the ocean floor slopes gradually. This causes major flooding.

15 Safir-Simpson Scale: a 5 category scale that groups hurricanes into groups by pressure, wind speed, and storm surge Target #22- I can identify what scale is used to measure the strength of a hurricane

16 Target #23- I can describe tornados
Tornado: a destructive rotating column of air that has very high wind speeds and that is visible as a funnel-shaped cloud Forms when a thunderstorm meets high-altitude winds The winds cause the rising air to rotate Moves unpredictably Measured by the Fujita Scale

17 Twister

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