Fronts Fronts Formed when two air masses collide

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Fronts

Fronts

Fronts • Formed when two air masses collide • A front is a narrow

Fronts • Formed when two air masses collide • A front is a narrow region separating two air masses of different characteristics (temperature, density)

Cold Front • Cold air pushes warm air up quickly • This front moves

Cold Front • Cold air pushes warm air up quickly • This front moves rapidly

Cold Front, cont’ • Cumulus and Cumulonimbus clouds are present • May cause thunderstorms

Cold Front, cont’ • Cumulus and Cumulonimbus clouds are present • May cause thunderstorms and tornadoes

 • Solid blue line with blue triangles that point in the direction that

• Solid blue line with blue triangles that point in the direction that the front is moving

Warm Fronts • Warm air “slides over” cold air • Moves slower

Warm Fronts • Warm air “slides over” cold air • Moves slower

Warm Fronts, cont’ • Less severe weather that lasts longer – Cloudy (stratus) and

Warm Fronts, cont’ • Less severe weather that lasts longer – Cloudy (stratus) and precipitation (steady light rain or snow)

 • Solid red line with red semicircles that point in the direction that

• Solid red line with red semicircles that point in the direction that the front is moving

Stationary Front • Two air masses meet and neither one is strong enough to

Stationary Front • Two air masses meet and neither one is strong enough to push the other out of the way

Stationary Front, cont’ • The weather associated with stationary fronts are like warm fronts

Stationary Front, cont’ • The weather associated with stationary fronts are like warm fronts • Last a few days or change into a cold/warm front • This front is characterized by a combination of cold and warm front symbols on a weather map

Occluded Front • Forms when a cold front is moving faster than a warm

Occluded Front • Forms when a cold front is moving faster than a warm front; the cold front catches up to, and takes over, the warm front • Precipitation is common on both sides of the front – can be light or heavy Occluded fronts are represented by alternating symbols for warm and cold fronts

Pressure Systems • H and L’s on weather maps = High and Low Pressure

Pressure Systems • H and L’s on weather maps = High and Low Pressure Areas • High pressure is formed by sinking air – Usually associated with nice weather since sinking air doesn’t form clouds • Low pressure is formed by rising air – Usually associated with bad weather because of air rising, forming clouds, leading to precipitation

 • H = Happy Weather • L = Lousy Weather

• H = Happy Weather • L = Lousy Weather

Lets Look at The Current Weather! • http: //www. weather. com/

Lets Look at The Current Weather! • http: //www. weather. com/