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WEATHER AROUND 
FRONTS AND 
CYCLOGENESIS
Weather Before 
• Weather is influenced by the air mass over a region 
• When a front begins to move over a region the wea...
Approaching Front 
• Cold Front 
• Rapid cloud development, cumulus and cumulonimbus. 
• Heavy precipitation, over a short...
Approaching Front 
• Occluded Front 
• Associated with large areas of rainy and severe weather 
• This is part of a low pr...
Behind the Front 
• After a front passes the weather will change. 
• After a cold front the: 
• Temperatures are cooler 
•...
Wrap Up 
• How does the weather change during and after a cold 
front? 
• What type of weather is associated with occluded...
Cyclogenesis 
• Cyclogenesis is the development of a low pressure 
system 
• Low pressure systems in the middle latitudes ...
Before the cyclone 
• A stationary front forms a boundary between a cold and 
warm air mass 
• These fronts can be found a...
Stages of a cyclone 
• Early Stage: A wave or “kink” in the front develops. 
• The wave begins to rotate and the low press...
Stages of a cyclone 
• Open Stage: The drier, cooler, more dense air begins to 
close in on the warm air. 
• This stage th...
Stages of a cyclone 
• Occluded Stage: The low pressure system becomes fully 
developed. 
• The cold front catches-up to t...
Stages of a cyclone 
• Dissolving Stage: The occluded front becomes larger and 
the supply of warm air is cut-off and push...
Wrap-up 
• Draw in an L where the low pressure is 
located. 
• Draw in where the fronts are located. 
• Which directions d...
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Weather around Fronts and Cyclogenesis

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What is happens around fronts and how to storm systems form? A presentation for high school science.

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Weather around Fronts and Cyclogenesis

  1. 1. WEATHER AROUND FRONTS AND CYCLOGENESIS
  2. 2. Weather Before • Weather is influenced by the air mass over a region • When a front begins to move over a region the weather changes • Once a front has moved pass a region the weather will shift to the new air mass in place • When a front approaches the pressure drops
  3. 3. Approaching Front • Cold Front • Rapid cloud development, cumulus and cumulonimbus. • Heavy precipitation, over a short time • In the Spring and Summer cold fronts will have thunderstorms, some may be severe • Front may pass through as fast as a few hours • Warm Front • Layered cloud development, cirrus clouds are indicators of an approaching warm front • Steady precipitation, over an extended time • Front may take several days to pass through
  4. 4. Approaching Front • Occluded Front • Associated with large areas of rainy and severe weather • This is part of a low pressure system • Stationary Front • Rainy weather around the front • Passage may take several days because the front is not moving, the front “stalls”
  5. 5. Behind the Front • After a front passes the weather will change. • After a cold front the: • Temperatures are cooler • Air is drier • Pressure is higher • After a warm front the: • Temperatures are warmer • The air is moist • Pressure is higher
  6. 6. Wrap Up • How does the weather change during and after a cold front? • What type of weather is associated with occluded and stationary fronts?
  7. 7. Cyclogenesis • Cyclogenesis is the development of a low pressure system • Low pressure systems in the middle latitudes are called mid-latitude cyclones • Mid-latitude cyclones usually develop along either the polar jet stream or the sub tropical jet stream • A mid-latitude cyclone goes through a life cycle of four stages
  8. 8. Before the cyclone • A stationary front forms a boundary between a cold and warm air mass • These fronts can be found along the jet stream
  9. 9. Stages of a cyclone • Early Stage: A wave or “kink” in the front develops. • The wave begins to rotate and the low pressure system is born • Precipitation begins to develop
  10. 10. Stages of a cyclone • Open Stage: The drier, cooler, more dense air begins to close in on the warm air. • This stage the warm and cold fronts become easily noticeable and more developed.
  11. 11. Stages of a cyclone • Occluded Stage: The low pressure system becomes fully developed. • The cold front catches-up to the warm front and creates an occluded front, this is part of the low pressure system. • The storm is biggest in this stage
  12. 12. Stages of a cyclone • Dissolving Stage: The occluded front becomes larger and the supply of warm air is cut-off and pushed aloft • The low-pressure begins to gradually dissipate
  13. 13. Wrap-up • Draw in an L where the low pressure is located. • Draw in where the fronts are located. • Which directions do all mid-latitude cyclones move? Why? • What stage is the cyclone in?

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