Fronts and pressure system notes of doom!

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Fronts and pressure system notes of doom!

  1. 1. Fronts and Pressure SystemNotes of Doom!
  2. 2. Remember what drives ourclimate/weather forces!
  3. 3. Another Example of ConvectionAnother Example of ConvectionConvection is heat energy moving as aConvection is heat energy moving as a fluidfluid fromfrom hotter tohotter tocoolercooler areasareas..Warm air at the ground surface rises as a thermal bubbleWarm air at the ground surface rises as a thermal bubbleexpands, consumes energy, and hence cools.expands, consumes energy, and hence cools.
  4. 4. Fronts• Air masses are large pockets/blobs of airthat move over land• When 2 air masses collide its called front.• Fronts- are narrow regions between 2 airmasses of different densities.• Density of air masses depend ontemperature, pressure, and humidity of air
  5. 5. Cold Front• Cold, dense air displaces the less densewarm air.• Precipitation and T-storms are common
  6. 6. Warm Front• Warm air displaces cold air• Light precipitation common along warmfronts.
  7. 7. Stationary Front• 2 air masses meet but do not advance• Frequently occur when both air masses have smalltemperature and pressure gradients between them.• Light winds and light precipitation
  8. 8. Occluded Front• Cold air moves so fast that it overtakes a warm front and pushes thewarm air upwards.• Cold air from behind warm front will meet up with cold air in front ofwarm front.• Strong winds and heavy precipitation common along occludedfronts.
  9. 9. Pressure System• Air will either rise or sink near the Earth’ssurface.• Air always from an area of high pressureto an area of low pressure.• Sinking or rising air with the Coriolis effect,results in rotating high and low pressuresystems. (Air moves in a circular motion)
  10. 10. Low-pressure system• Air rises and air coming in from outside spirals inward towards thecenter. Then it continues up.• Spiraling air is due to coriolis effect• Air rises, cools, and condenses into clouds and precipitation(usually)
  11. 11. High-pressure system• Sinking air moves away from the center when it reaches the Earth’ssurface.• High pressure systems are usually associated with fair weather.

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