Review 13: Weather. 1.Meteorologist – scientists who study the weather. What direction do most weather systems travel in the U.S.? Review 13: Weather

Review 13: Review 13: WeatherWeather

1.1. Meteorologist – scientists who study the Meteorologist – scientists who study the weather.weather.

What direction do most weather systems What direction do most weather systems travel in the U.S.?travel in the U.S.?

Review 13: WeatherReview 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


water

evaporationrunoff

condensationprecipitation

ground water

transpiration

condensationHow 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.


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?


CirrusCirrus – highest clouds – highest clouds bring fair weatherbring fair weather

CumulusCumulus – bright white – bright white wads of cottonwads of cotton

seen with fair weatherseen with fair weather


CumulonimbusCumulonimbus – largest – largest clouds. Bring heavy rain, high clouds. Bring heavy rain, high

winds, hail and tornadoes.winds, hail and tornadoes.

StratusStratus – form gray sheets – form gray sheets that spread across the skythat spread across the skyBring heavy mist and snowBring heavy mist and snow

or drizzleor 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.


Make a prediction. What kind of precipitation will fall if Make a prediction. What kind of precipitation will fall if there are:there are:

Below-freezing temperatures in the cloudsBelow-freezing temperatures in the cloudsTemp. barely above freezing on the ground?Temp. barely above freezing on the ground?

Describe the Describe the air temperatureair temperature, , precipitationprecipitation, , windswinds, , and and humidity humidity during:during:

Winter?Winter? Spring?Spring?

Summer?Summer? Fall?Fall?


Wind speedWind speed is described in miles per hour. is described in miles per hour.

Wind directionWind direction is the direction from which is the direction from which the wind blows.the wind blows.

A north wind comes from the north.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


Tools to gather data Tools to gather data about the weather:about the weather:

ThermometerThermometer – measures – measures temperaturetemperature

AnemometerAnemometer – measures – measures wind speedwind speed


Tools to gather data about the Tools to gather data about the weather:weather:

Rain GaugeRain Gauge – measures the – measures the amount of precipitationamount of precipitation

BarometerBarometer – measures air pressure – measures air pressure

Weather VaneWeather Vane – –

indicates wind directionindicates wind direction


TornadoTornado – a small storm – a small storm that forms funnel clouds that forms funnel clouds of powerful winds, of powerful winds, sometimes topping 300 sometimes topping 300 miles per hour.miles per hour.

ThunderstormThunderstorm – a large – a large storm bringing violent storm bringing violent winds, heavy rain and winds, heavy rain and lightning.lightning.


BlizzardBlizzard – a strong – a strong winter storm that winter storm that brings high winds, brings high winds, very cold very cold temperatures and temperatures and heavy snow.heavy snow.

HurricaneHurricane – a severe – a severe tropical storm that tropical storm that brings strong, brings strong, destructive winds and destructive winds and tidal surges.tidal surges.


Fronts Fronts – lines that connect a very large – lines that connect a very large mass of air having the same temperature, mass of air having the same temperature, pressure and moisture.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.

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Review 13: Weather. 1.Meteorologist – scientists who study the weather. What direction do most weather systems travel in the U.S.? Review 13: Weather