Chapter 17 - Weather Flashcards
A quantity that can change.
Variable
The force that a column of air applies in the air or a surface below it.
Air pressure
A machine that measures air pressure.
Barometer
Wind moves from where to where?
High to low pressure.
If a wind blows from west to east, is it a westerly or an easterly?
Westerly.
What machine is used to measure wind speed?
Anemometer
The amount of water vapor in the air.
Humidity
A machine used to measure humidity.
Hygrometer
The amount of water vapor in the air compared to the amount of water vapor the air could hold at that temperature, expressed as a percentage.
Relative humidity
The temperature at which the air is saturated with water vapor and condensation can occur.
Dew point
To be so full of something that you cannot absorb any more.
Saturated
Flat, white, and layered clouds
Stratus
Fluffy, heaped, or piled up clouds
Cumulus
Wispy, high clouds
Cirrus
A cloud near or on the surface.
Fog
Water, in liquid or solid form, that falls from the atmosphere.
Precipitation.
Precipitation that reaches the earth a droplets of water.
Rain
The atmospheric conditions and short term changes for a certain place at a certain time.
Weather
變量
Variable
氣壓計
Barometer
氣壓
Air pressure
濕度
Humidity
濕度器
Hygrometer
相對濕度
Relative humidity
露點
Dew point
飽和
Saturated (tricky, but correct for weather and humidity)
層雲
Stratus
積雲
Cumulus
卷雲
Cirrus
霧
Fog (or mist)
降水
Precipitation
A large body of circulating air with high pressure at its center and lower pressure outside of the system.
high-pressure system
A large body of circulating air with low pressure at its center and higher pressure outside of the system.
low-pressure system
In a high-pressure system, does air move to or away from the center?
away
Which system brings clear skies and fair weather?
High pressure system
Which system brings clouds and, at times, precipitation?
Low-pressure system
Large bodies of air that have uniform temperature, humidity, and pressure.
Air mass
These air masses form over Siberia and the Arctic.
Arctic Air Mass
These air masses can bring temperatures to -40C
Arctic Air Mass
A bitterly cold, dry air mass.
Arctic Air Mass
These air masses form over northern Canada and Northern Russia.
Continental Polar Air Mass
These air masses are fast moving and bring cold weather in winter and cool weather in summer.
Continental Polar Air Mass
These air masses form over the northern oceans.
Maritime Polar Air Mass
These air masses are cold and humid.
Maritime Polar Air Masses
These air masses bring cloudy, rainy weather.
Maritime Polar Air Masses
These air masses form in the tropics over deserts.
Continental Tropical Air Masses
These air masses are hot and dry.
Continental Tropical Air Masses
These air masses bring clear skies and high temperatures.
Continental Tropical Air Masses
These air masses form over the southern oceans, often near the Philippines.
Maritime Tropical Air Masses
These air masses form hurricanes and typhoons.
Maritime Tropical Air Masses
These air masses have hot, humid air.
Maritime Tropical Air Masses
These air masses can bring very heavy snowfall in winter.
Maritime Tropical Air Masses
A boundary between two air masses.
Front
Drastic weather changes occur at…
Fronts
A cold air mass moves towards a warmer air mass.
Cold Front
Cold fronts can bring a temperature decrease of up to..
10C
Less dense warm air moves towards colder, denser air.
Warm Front
What weather do cold fronts typically bring?
Gusty wind, severe storms
What weather do warm fronts typically bring?
Steady precipitation, warming temperatures, shift in wind direction.
What happens when a warm front and a cold front meet each other and neither is stronger?
Stationary front
What weather is associated with a stationary front?
Unending rain
What is the local name for a repeating stationary front in Taiwan?
Plum rains