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Weather

Weather. Weather. Weather - Short term conditions of the atmosphere based on four things: 1. Temperature 2. Humidity 3. Air pressure 4. Wind. Causes: Sun & Moisture. A. Sun Without it, there would be NO weather!

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Weather

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  1. Weather

  2. Weather • Weather- Short term conditions of the atmosphere based on four things: • 1. Temperature • 2. Humidity • 3. Air pressure • 4. Wind

  3. Causes: Sun & Moisture • A. Sun • Without it, there would be NO weather! • Weather systems start because the sun's energy heats up some parts of Earth more than others.  • Earth is tilted on its axis at exactly the right angle to have seasons. • Its different parts are heated more or less during different times of the year. • B. Moisture • Both work together to form clouds, make precipitation, and cause winds to blow.

  4. Air Masses • Air Masses- Large bodies of air with similar temperature and moisture. • Must have three things in common: • Must be large in size • Must be consistent in temperature, humidity, and stability at any point within. • Must be strongly bound together so that it does not break apart as its pushed along its course. • Without them, the weather on Earth would stay in one place.

  5. Movement of Air Masses • As air masses leave their source region and begin moving to other areas, they bring with them the conditions that are common in the source region: • For example: An air mass that formed over a Northern region, such as Canada, will be cold (especially if it forms during the winter). • As this air mass begins to move towards the South, it brings with it the cold temperatures that are common in the Northern parts of Canada. • When this happens, Southern parts of the continent experience much cooler weather than they are used to.

  6. Fronts • Fronts – The boundary that forms between two air masses that meet. • This boundary forms because when the two air masses meet, the air within them does not mix. • They are actually sloped (like a hill). • Often the slope of a front can be extremely gradual, taking hundreds of miles across the surface of the Earth to reach an altitude of just one mile.

  7. 3 Common Types: Cold Front • 1. Cold Front– Transition zone where cold air is replacing warm air. • The air behind a cold front is cooler and drier. • The temperature can drop more than 15 degrees in one hour. • Produces severe weather (thunderstorms, tornadoes, and snowstorms). • Weather Map= Represented by a solid blue line with small triangles pointing in the direction that the front is moving.

  8. Cold Front

  9. Warm Front • Warm Front– Transition zone where warm air is replacing cold air. • The air behind a warm front is warmer and more humid. • Produces cirrus clouds. • Associated with less severe weather. • Produce steady precipitation that lasts for days. • Fog is also common. • Weather Map= Represented by a solid red line with semicircles pointed toward the cold air.

  10. Warm Front

  11. Stationary Front • Stationary Front- Occurs when a cold or warm front stops moving. • Weather involves clouds and long periods of precipitation. • Weather Map= Represented by alternating blue triangles and red semicircles.

  12. Stationary Front

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