Fronts and pressure system notes of doom!

Fronts and pressure system notes of doom!

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  Fronts and PressureSystem Notes of Doom!
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  Remember what drivesour climate/weather forces!
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  Another Example ofConvectionAnother Example of Convection Convection is heat energy moving as aConvection is heat energy moving as a fluidfluid fromfrom hotter tohotter to coolercooler areasareas.. Warm air at the ground surface rises as a thermal bubbleWarm air at the ground surface rises as a thermal bubble expands, consumes energy, and hence cools.expands, consumes energy, and hence cools.
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  Fronts • Air massesare large pockets/blobs of air that move over land • When 2 air masses collide its called front. • Fronts- are narrow regions between 2 air masses of different densities. • Density of air masses depend on temperature, pressure, and humidity of air
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  Cold Front • Cold,dense air displaces the less dense warm air. • Precipitation and T-storms are common
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  Warm Front • Warmair displaces cold air • Light precipitation common along warm fronts.
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  Stationary Front • 2air masses meet but do not advance • Frequently occur when both air masses have small temperature and pressure gradients between them. • Light winds and light precipitation
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  Occluded Front • Coldair moves so fast that it overtakes a warm front and pushes the warm air upwards. • Cold air from behind warm front will meet up with cold air in front of warm front. • Strong winds and heavy precipitation common along occluded fronts.
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  Pressure System • Airwill either rise or sink near the Earth’s surface. • Air always from an area of high pressure to an area of low pressure. • Sinking or rising air with the Coriolis effect, results in rotating high and low pressure systems. (Air moves in a circular motion)
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  Low-pressure system • Airrises and air coming in from outside spirals inward towards the center. Then it continues up. • Spiraling air is due to coriolis effect • Air rises, cools, and condenses into clouds and precipitation (usually)
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  High-pressure system • Sinkingair moves away from the center when it reaches the Earth’s surface. • High pressure systems are usually associated with fair weather.