Presentation on theme: "Review 13: Weather. 1.Meteorologist – scientists who study the weather. What direction do most weather systems travel in the U.S.? Review 13: Weather."— Presentation transcript:
1.Meteorologist – scientists who study the weather. What direction do most weather systems travel in the U.S.? 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 Earths weather Review 13: Weather water evaporation runoff condensation precipitation ground water transpiration condensation How many types of precipitation can you name?
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. 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. Review 13: Weather 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?
Review 13: Weather Cirrus – highest clouds bring fair weather Cumulus – bright white wads of cotton seen with fair weather
Review 13: Weather Cumulonimbus – largest clouds. Bring heavy rain, high winds, hail and tornadoes. Stratus – form gray sheets that spread across the sky Bring heavy mist and snow or drizzle or drizzle Describe the clouds you see outside. Do they fit any of the categories?
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. 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? 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 dot points to the direction the wind is going. The barbs on the tail show the speed of the wind. More barbs – faster wind Review 13: Weather
Tools to gather data about the weather: Thermometer – measures temperature Anemometer – measures wind speed 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 Review 13: 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. 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. Review 10: Weather
Fronts – lines that connect a very large mass of air having the same temperature, pressure and moisture. Review 10: Weather 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.