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a measure of the amount of water vapor present in the air compared to the amount needed for saturation at a specific temperature
a large body of air that has properties similar to the part of Earth's surface over which it develops
a violently rotating column of air in contact with the ground, winds up to 300 miles per hour
a large, swirling, low-pressure system that forms over water, winds up to 150 miles per hour
a winter storm that only occurs if the winds are 56 km/h, the temperature is low, visibility is less than 400m in falling or blowing snow, and if these conditions persist for 3 hours or more
studies weather and uses information from Doppler radar, weather satellites, computers, and other instruments to make weather maps and provide forecasts
indicates weather conditions at a specific location using a combination of symbols on a map
lines drawn on a weather map that connect points having equal atmospheric pressure; also indicate the location of high and low pressure areas and can show wind speed
precipitation that passes through a layer of freezing temperatures and forms small ice pellets
pellets of ice that form in cumulonimbus clouds during a thunderstorm when water freezes in layers around a small nucleus of ice
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