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All Things Weather Wise

All Things Weather Wise. Weather Instruments, Pressure Systems and Fronts. Warm Up. What is air pressure? What happens to the molecules when air warms up? Why does air move out of a filled balloon when you untie the end?. Warm Up. Why is it hot at the equator and cold at the poles?

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All Things Weather Wise

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  1. All Things Weather Wise Weather Instruments, Pressure Systems and Fronts

  2. Warm Up • What is air pressure? • What happens to the molecules when air warms up? • Why does air move out of a filled balloon when you untie the end?

  3. Warm Up • Why is it hot at the equator and cold at the poles? • What is needed to create an area of high pressure? • What causes low pressure? • What happens to air at the poles? At the equator? • What is wind?

  4. Warm Up • What type of clouds are associated with good weather? • How is weather described? List 7 factors. • How do clouds form? • Describe a convection current.

  5. Warm Up • What causes low pressure on the Earth’s surface? • What type of weather is associated with a cold front? • What is wind? What causes it? Which way does air move? • What is the role of ozone in the stratosphere? • What happens to temperature in the troposphere?

  6. What Is Weather? …Conditions of the atmosphere at a given place and time. • Air pressure • Temperature • Wind speed, wind direction • Cloud cover, type • precipitation

  7. Weather Instruments: Anemometer • Measures wind speed • Wind turns the cups; faster wind turns cups faster • Faster wind = higher wind speed • Wind speed measured in mph or kph

  8. Weather Instrument: Barometer • Measures air pressure • When air pressure increases, the air pushes down on the mercury, which then rises in the tube. • Changes in air pressure can help to forecast weather

  9. Wind Sock • Wind fills the cone shaped bag • Tells the direction of the wind • Always name winds by where they are blowing FROM - A southeast winds blows from the southeast

  10. High Pressure System • Cooler, sinking air • Creates generally clear days, good weather • May be small cumulus clouds, if any H

  11. Low Pressure System • Warmer, rising air • Stratus clouds form if there is enough moisture in the air • Drizzle or rain may occur L

  12. Warm Front • When a warm air mass overtakes a cooler air mass • Warm air rises over cool air • Light to moderate, but steady rain at frontal boundary • Temperature increases after front passes

  13. Warm Front

  14. Cold Front • Cold air mass overtakes warmer air mass • Cooler air nudges under warmer air • Heavy, short periods of showers at frontal boundary • Temp drops!

  15. Cold Front

  16. And Just a Bit About Hurricanes • Form in the tropics over water that is greater than 79 degrees Fahrenheit • Gathers strength as it remains over sea • A storm must have winds of 75mph to be considered a hurricane; otherwise, it’s just a tropical storm or depression • As it makes landfall, storm weakens, but can still have disastrous effects

  17. Eye Hurricane - A low pressure system where winds blow counterclockwise

  18. Warm Up Draw a Venn diagram comparing warm and cold fronts. Include at least two differences and two similarities.

  19. Warm Warm air rises slowly over cold Stratus clouds form Moderate precip over a long time Cold Warm air rises quickly Cumulonimbus Thunderstorms can include lightning and hail and tornadoes Warm vs. Cold Fronts • Both • Change the air temp • Occur when air masses meet • Happen over land or water • Can happen anytime

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