3 This usually means CLEAR WEATHER. This usually means STORMY weather. What Does It All Mean?TheHstands for aHigh Pressure SystemThis usually means CLEAR WEATHER.TheLstands for aLow Pressure SystemThis usually means STORMY weather.
4 What are Air Masses????Large areas of air that have the same weather, temperature, and humidity.Weather changes occur as air masses move and interact.
5 What are Fronts??? A front is the boundary between two air masses. Fronts bring changes in the weather. Because of the wind patterns, they generally move from west to east in the US.Fronts are named for the air that is behind them.
6 Cold FrontCold dense air pushes warm air out of the way. Cold fronts move very quickly and bring short periods of rain/thunderstorms. Lower temperatures are behind the front. SYMBOL – the direction of the “arrows” points towards the direction the front is MOVING.
10 Warm FrontWarm air moves up the cold front as it slowly displaces the cold air.Warm fronts move slowly and can bring many days of steady precipitation.Higher temperatures are behind the front.SYMBOL – direction of semicircles is the direction the front is moving.
14 Stationary FrontThe air from the warm front and cold front meet, but do not move.These fronts have weather similar to warm fronts.SYMBOL – warm and cold air masses are moving in opposite directions, thus making a stationary condition
15 Stationary FrontWhere the warm and cool air meet, water vapor in the warm air condenses into rain, snow, fog, or clouds.
16 Let’s see it on the map! Stationary Front Cold Front Warm Front Click for Current Weather Map!