Review 13: Weather

1. Review 13: Weather

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

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

7. Stratus – form gray sheets that spread across the sky Bring heavy mist and snow or drizzle Review 13: Weather 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. Review 13: Weather Tools to gather data about the weather: Thermometer – measures temperature Anemometer – measures wind speed

12. 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.