1. Review 13: Weather

2. Review 13: Weather Meteorologist – scientists who study the weather.
What direction do most weather systems travel in the U.S.?

3. How many types of precipitation can you name?
Review 13: Weather
2. Humidity – the amount of water vapor in the air.
 Determines whether precipitation will fall
The higher the humidity, the more likely it is there will be precipitation.
3. Water cycle – drives the Earth’s weather
How many types of precipitation can you name?
condensation
condensation
precipitation
transpiration
evaporation
runoff
ground water
water

4. Review 13: Weather
3. Air pressure – the weight of all the air molecules in an area.
4. Barometric pressure – air pressure caused by the weight of the air.

5. Review 13: Weather
5. High-pressure system – when cold air sinks to the ground, warms up, and absorbs water vapor, causing sunny skies.
6. Low-pressure system – when warm air rises higher in the sky, causing water vapor to cool and form clouds and precipitation.
Predict what will happen if a high-humidity air mass located over an ocean moves inland and up a mountain slope. Why do you think so?

6. Cirrus – highest clouds bring fair weather
Review 13: Weather
Cirrus – highest clouds
bring fair weather
Cumulus – bright white wads of cotton
seen with fair weather

7. Review 13: Weather
Stratus – form gray sheets that spread across the sky
Bring heavy mist and snow
or drizzle
Cumulonimbus – largest clouds. Bring heavy rain, high
winds, hail and tornadoes.
Describe the clouds you see outside.
Do they fit any of the categories?

8. Review 13: Weather
7. Hail – when a raindrop freezes and forms an icy ball before falling to the ground.
8. Sleet – when a raindrop falls from a cloud and passes through below-freezing air making a slushy blob.
9. Snow – when ice crystals form in clouds and fall to the ground without melting.

9. Review 13: Weather
Make a prediction. What kind of precipitation will fall if there are:
Below-freezing temperatures in the clouds
Temp. barely above freezing on the ground?
Describe the air temperature, precipitation, winds, and humidity during:
Winter? Spring?
Summer? Fall?

10. Review 13: Weather Wind speed is described in miles per hour.
Wind direction is the direction from which the wind blows.
A north wind comes from the north.
The tail points to where the wind is coming from.
The barbs on the tail show the speed of the wind. More barbs – faster wind
The dot points to the direction the wind is going.

11. Tools to gather data about the weather:
Review 13: Weather
Tools to gather data about the weather:
Thermometer – measures temperature
Anemometer – measures wind speed

12. Tools to gather data about the weather:
Review 13: Weather
Tools to gather data about the weather:
Rain Gauge – measures the amount of precipitation
Barometer – measures air pressure
Weather Vane –
indicates wind direction

14. Review 10: Weather
Tornado – a small storm that forms funnel clouds of powerful winds, sometimes topping 300 miles per hour.
Thunderstorm – a large storm bringing violent winds, heavy rain and lightning.

15. Review 10: Weather
Blizzard – a strong winter storm that brings high winds, very cold temperatures and heavy snow.
Hurricane – a severe tropical storm that brings strong, destructive winds and tidal surges.

16. Review 10: Weather
Fronts – lines that connect a very large mass of air having the same temperature, pressure and moisture.
Warm front – front of a warm air mass. Brings steadier, lighter precipitation.
Cold front – front of a cold air mass. Brings a drop in temperature and stormy weather.