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
boundary between two air masses with different temperatures, density, or moisture; can be cold, warm, occluded, and stationary.
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.
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.
measure of the amount of moisture it cna hold at a given temperature; can range from 0 percent to 100 percent.
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.