WEATHER

1
WEATHER

• -the state of the atmosphere at a specific time
  and place
• -air pressure, wind, temperature, and humidity
• - The SUN provides most of Earths energy,
  driving the water cycle

2
AIR TEMPERATURE

• A measure of how much molecules are moving
• Higher temp faster moving, far apart molecules
• Lower temp slower moving, closer together
  molecules

3
WIND

• Caused by air moving from areas of high pressure
  to areas of lose pressure
• Anemometer- an instrument that measures wind speed

4
HUMIDITY

• The amount water vapor present in the air
• Warmer temperatures allow for the humidity of air
  to be higher
• Condensation occurs when there is enough water
  vapor in the air for it to be saturated
• Relative humidity- the measure of the amount of
  water vapor present compared to the amount needed
  for the air to be saturated at a specific
  temperature

5

• The TEMPERATURE at which air is saturated and
  condensation occurs
• It changes with the amount of water vapor in the
  air

6
CLOUDS

• Form as warm air is forced upwards, expands, and
  then cools
• Made of billions of tiny droplets of water
  attached to small particles of dust or salt that
  are suspended in the air
• 3 main types

7
STRATUS

• Form at low altitudes and are associated with
  fair weather, rain, or snow

8
CUMULUS

• masses of puffy, white clouds, with flat bases
• Found at great heights
• Associated with fair weather and thunderstorms

9
CIRRUS

• Fibrous and curly
• High, thin, white, feathery cloud made of ice
  crystals
• Associated with fair weather and can indicate
  approaching storms

10
PRECIPITATION

• Water falling from clouds
• Rain- temperature above freezing
• Snow- water vapor turns directly to a solid
• Sleet- starts as rain but then freezes on the way
  down
• Hail- lumps of ice