The process by which water vapor enters the atmosphere during the water cycle
What is evaporation
100
On a weather map, a line with triangles pointing down shows this
What is a cold front moving south
100
Sudden, violent flood that occur shortly after a storm
What are flash floods
100
The boundary where unlike air masses meet but do not easily mix
What is a front
100
The most dangerous aspect of a snowstorm
What are high winds
200
The instrument used to measure relative humidity
What is a psychrometer
200
The collecting of weather data in the last 40 years has been improved mostly by these
What are balloons and satellites
200
A long period of scarce rainfall or dry weather that results in a shortage of water
What is a drought
200
Weather associated with an anticyclone is generally
What is dry and clear
200
Storms that form within large cumulonimbus clouds and produce rain and lightning
What are thunderstorms
300
Cooling of the air and the presence of particles are both required for this
What is cloud formation
300
Small lines at the end of the shaft that represents wind direction on a weather map indicate this
What is wind speed
300
On average, a snowfall of 30 centimeters would equal a rainfall of how many centimeters?
What is 3 centimeters
300
Warm air meets and moves over cold air at this type of front
What is a warm front
300
Tornadoes and thunderstorms both form in this kind of cloud
What is a cumulonimbus cloud
400
Very high feathery clouds
What are cirrus clouds
400
On newspaper weather maps, colors are often used to indicate these for different areas
What are temperature ranges
400
Rain or snow is usually associated with what kind of air pressure?
What is falling air pressure
400
Storms, precipitation, and low air pressure are often associated with these
What are cyclones
400
A hurricane's storm surge is caused by a combination of high winds and
What is low pressure
500
The percentage of water vapor that is actually in the air compared to the maximum amount of water vapor the air can hold
What is relative humidity
500
Weather forecasts are not always accurate because one small change in the weather today can cause a larger change in the weather a week later. This is referred to as what?
What is the butterfly effect
500
The five types of precipitation
What is rain, freezing rain, sleet, snow, and hail
500
Cold, dry air affecting the northern United States in winter often comes from
What are continental polar air masses
500
This occurs where a cold, dry air mass meets a warm, humid air mass