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Aim: Why does it rain?

Aim: Why does it rain?. Do now: As temperature increases, pressure ________. As temperature decreases, pressure ________. Dewpoint. Random Regents Question…. What occurs when a rock is crushed into a pile of fragments?. The total surface area decreases and chemical composition changes.

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Aim: Why does it rain?

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  1. Aim: Why does it rain? Do now: As temperature increases, pressure ________. As temperature decreases, pressure ________. Dewpoint

  2. Random Regents Question… What occurs when a rock is crushed into a pile of fragments? • The total surface area decreases and chemical composition changes. • The total surface area decreases and chemical composition remains the same. • The total surface area increases and chemical composition changes. • The total surface area increases and chemical composition remains the same.

  3. 1) Dewpoint: • The temperature that the air must drop to in order to reach 100% relative humidity • If the temperature and dewpoint are close, humidity is high • If they are the same…. • Humidity is 100% • ESRT p. 12

  4. 2) Adiabatic Cooling • As air rises, it expands and cools • As air cools, relative humidity increases • As wet air cools to the dewpoint, it condenses on to small particles in the atmosphere (condensation nuclei) • ash, pollution, pollen etc… • Cloud Droplets

  5. Water Droplets • Cloud droplets stick together to form clouds • They get heavy and fall as rain Condensation Nuclei

  6. The air temperature is 10°C .  Which dewpoint temperature would result in the highest probability of precipitation? • 8°C • 6°C • 0°C • - 4°C

  7. Which graph best shows the relationship between the probability of precipitation and the difference between air temperature and dewpoint?

  8. Various weather conditions at LaGuardia Airport in New York City are shown on the station model below. What were the barometric pressure and weather conditions at the airport at the time of the observation? • 914.6 mb of pressure and smog • 914.6 mb of pressure and a clear sky • 1014.6 mb of pressure and smog • 1014.6 mb of pressure and a clear sky

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