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air mass

large body of air that has the same characteristics of temperature and moisture content as the aprt of Earth's surface over which it formed.


winter storm that lasts at least three hours with temperatures of -12C or below, poor visiblity, and winds of at least 51 km/hr

dew point

temperture at which air is saturated and condensation forms.


a stratus cloud that forms when air is cooled to its dew point near the ground.


boundary between two air masses with different temperatures, density, or moisture; can be cold, warm, occluded, and stationary.


amount of water vapor held in the air.


large, severe storm that forms over tropical oceans, has winds of at least 120 km/hr, and loses power when it reaches land.


lines drawn on a weather map that connect points having equal atmospeheric pressure; also indicate the location of high- and low- pressure areas and can show wind speed.


line drawn on a warth map that connects points having equal temperature


studies weath eran duses information from Doppler radar, weather satellites, computers and other instruments to make warth maps and provide forecasts.


water falling from clouds-including rain, snow, sleet, and hail- whose form is determined by air temperature.

relative humidity

measure of the amount of moisture it cna hold at a given temperature; can range from 0 percent to 100 percent.

station model

indicates weather conditions at a specific location, using a combination of symbols on a map.


violent, whirling windstorm that crosses land in a narrow path and can result from wind shears inside a thunderhead.


state of the atmosphere at a specific time and place, determined by factors including air pressure, amount of moisture in the air, temperature, and wind.

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