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Control

Don't speak when I'm speaking.

Answer questions by raising your hand.

Importance

Much of this will be on your aviation exam. Much of this is basic information that you'll want to know as an adult pilot or not. Pilot especially though.

Oh ya, did I mention your exam is first block next week with me?

MTP's

1) Humidity

2) Temperature

3) Effects of Temperature on Relative Humidity

4) Effects of Temperature and Humidity on Weather

5) Types of Precipitation

Humidity is the amount of water vapour in a given space of air.

Condensation is when a gas turns into a liquid.

Sublimation is when a gas turns into a solid without becoming a liquid.

Dew Point: The temperature at which the air will become saturated. Clouds will generally form.

Relative Humidity: RH is how much water vapour (moisture) there is in a space of air compared to the most it could hold.

Confirmation:

  • What is Dew Point?
  • What is Relative Humidity?

Diurnal Variation: Day is hotter than night.

Seasonal Variation: Summer>Fall>Spring>Winter

Confirmation:

  • What is Convection?
  • What is Advection?
  • What is Radiation?

Confirmation:

  • As temperature increases, RH __________.
  • As temperature decreases, RH __________.

Snow Pellets: Like mini-snowballs. They are hail that hasn't formed properly.

Types of Precipitation

Effects of Temperature on Relative Humidity

Precipitaion is anything weather falling from the sky.

Liquid

Relative Humidity: RH is how much water vapour (moisture) there is in a space of air compared to the most it could hold.

Drizzle: These are itty-bitty, light drops of water the gently float to earth.

Rain: Falling water.

Heat causes air to expand. It takes up more space, and can hold more moisture. But temperature doesn't increase moisture, so the percentage of how much space the water takes up goes down.

Frozen

Snow: Frozen falling white water.

Ice Prisms: Microscopic icicles that form in cold stable air. Water freezes, but doesn't yet weigh enough to fall.

Ice Pellets: Frozen raindrops. They bounce on impact!

Hail: Ice pellets that get pushed back up into the cloud and get bigger and bigger until they are too fat to fly.

Class Overview

Humidity, Temperature and Weather

FSgt Ralphs EOM 336.04 60 min

Temperature

Temperature is a reading of how much heat is present. Air has temperature too, but it isn't heated by the sun.

The sun heats the earth, and the earth releases heat into the air. This is called "heating from below."

Humidity

Heating Processes

Cooling Processes

  • Convection: Air touching the earth is heated and rises above cool air.
  • Advection: Air touching the earth is blown from one location to another and changes temperature to match.
  • Compression: Sometimes air is pushed down from above, and this squishes air together, they become warmer.
  • Radiation: The earth cools at night and by doing so also cools the air touching its surface.
  • Advection: Air is blown from one place to another and changes temperature to match.
  • Adiabatic: Air is warmed, rises, and as it rises, it can expand and cool.

Effects of Temperature and Humidity on Weather

  • Dew Point: Hotter temperature means the difference between temperature and dew point is larger, and ____________________.

  • Relative Humidity: If the air is warmed and grows larger , the water takes up less space and RH percent decreases.

  • Precipitation: Temperature dictates whether there is precipitation or not, and what type it is.
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