these form when water vapor cools and condenses on dust particles in the air
What are clouds?
100
temperature in Celcuis and Fahrenheit at which water changes from a liquid to a solid (freezes)
What is 0˚C and 32˚F?
100
used to measure air pressure
What is a barometer?
100
the letter H on a weather map is a symbol that indicates this
What is high pressure?
100
the pattern of weather in an area over a period of time
What is climate?
200
when water vapor rises, cools, and becomes a liquid
What is condensation?
200
occurs when water vapor turns into ice crystals (freezes) within a cloud
What is snow?
200
TWO instruments that can be used to measure wind (direction and speed)
What is a wind vane (or wind sock) and an anemometer?
200
a rising barometer (increasing air pressure) usually indicates this kind of weather
What is cooler air and fair weather?
200
a stream of water or air that flows like a river
What is a current?
300
this occurs as water becomes too heavy to remain in a cloud
What is precipitation?
300
three types of clouds:
1. white, puffy, fair weather
2. low, layered, blanket the sky, can produce moderate rain or snow
3. high, wispy, made of ice crystals
What is cumulus, stratus, and cirrus?
300
measures air temperature
What is a thermometer?
300
created when two air masses meet
What is a front?
300
the condition of the atmosphere in a certain place at a certain time
What is weather?
400
this occurs when water collects in bodies of water or underground
What is accumulation?
400
temperature at which water boils (˚C AND ˚F)
What is 100˚C AND 212˚F?
400
measures humidity
What is a hygrometer?
400
this kind of weather can be predicted when a warm air mass moves over a cold air mass
What is steady rain or snow?
400
the measurement of moisture in the air
What is humidity?
500
occurs when water changes from a liquid to a gas
What is evaporation?
500
TWO types of precipitation that occur when rain passes through freezing-cold air
What is sleet and hail?
500
often hangs on a pole at small airports to determine wind direction
What is a wind sock?
500
a line with arrows pointing down is a weather map symbol that represents this, and a line with semicircles on a weather map indicates this