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Grade 8 Science Unit: 08 Lesson: 01 Weather Symbols Term Symbol Moves in the direction of triangles Cold Front http://upload.wikimedia.org/wikipedia/commons/c/c0/Cold_front_symbol.svg Moves in the direction of semi-circles Warm Front http://upload.wikimedia.org/wikipedia/commons/4/40/Warm_front_symbol.svg ©2012, TESCCC 05/15/13 Description Cold, dense air is moving toward warm, less dense air. The warm air is pushed up to cool and form clouds as the cooler air replaces it. The air on the front side of the boundary line is warmer than the air on the back side of the boundary line. These fronts are usually fast moving and bring stormy weather and heavy precipitation followed by clearing skies and higher pressure. Warm air is moving toward cold air. The warm, less dense air slides over the cold, more dense air. The air on the front side of the boundary line is cooler than the air on the back side of the boundary line. These fronts usually move slowly and bring steady rain or snow over many days. page 1 of 3 Grade 8 Science Unit: 08 Lesson: 01 Not moving Stationary Front http://upload.wikimedia.org/wikipedia/commons/d/d3/Stationary_front_symbol.svg High Pressure http://commons.wikimedia.org/w/index.php?title=File:High_pressure_symbol.svg&page=1 ©2012, TESCCC 05/15/13 These fronts occur when neither the cool or warm air masses are strong enough to replace each other. They tend to stay in an area for a long period of time, often bringing long periods of precipitation and clouds. Cooler, dense air close to the surface of the Earth surrounded by winds flowing in a clockwise direction in the Northern hemisphere. Usually brings dry conditions and fair skies. page 2 of 3 Grade 8 Science Unit: 08 Lesson: 01 Low Pressure http://commons.wikimedia.org/w/index.php?title=File:Low_pressure_symbol.svg&page=1 Warmer, less dense air above the Earth’s surface surrounded by winds moving in a counterclockwise direction in the Northern hemisphere. This is associated with the formation of storms. A high speed wind current high in the Earth’s troposphere between two different temperature air masses. It flows from west to east due to the Coriolis Effect. Jet Stream http://commons.wikimedia.org/wiki/File:N_Jetstream_Rossby_Waves_N.gif ©2012, TESCCC 05/15/13 page 3 of 3
