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Presentation transcript:

Science News

The study of atmospheric phenomena What is Meteorology? The study of atmospheric phenomena Greek root word meteoros.. High in the air

Examples of meteors…

Examples of meteors…

Anything high in the sky Raindrops Rainbows Dust Snowflakes Fog Lighting

Atmosphere phenomena are classified as types of meteors Hydrometeors: cloud droplets & precipitation (rain, snow & sleet) Lithometeors: suspended particles (smoke, dust & haze) Electrometers: signs of electricity (thunder & lighting)

Variations of Atmosphere Phenomena Weather: short term variations in atmospheric phenomena Climate: long term average of variations in weather for a particular area (over 30 years)

4 causes of weather The uneven solar heating of the earth’s surface Transfer of thermal energy (R,C,C) Water phase change (E,C,P) releasing latent heat Air masses traveling & colliding

Air Masses Air Mass: a large body of air that has the same characteristics (Temperature & Moisture) as its source region Source Region: area of earth’s surface that effects air mass formation Air Mass Modification: As it moves over land or water with different characteristics, it transfers thermal energy and/or moisture

Air Mass Classification Moisture: influenced by surface designated m for maritime (wet) & c for continental (dry) Temperature: influenced by latitude High Latitude = Cold & Low Latitude = Warm A (arctic), P (polar) and T (tropical)

Mid latitudes are zones of clashing air masses = stormy

Air Masses Effecting North America Much of the weather in North America, especially weather east of the Rocky Mountains, is influenced by continental polar (cP) & maritime tropical (mT) air masses.

Good Good Good Good Good Good Good

Air Mass Characteristics p. 316 Table 12.1

Continental polar (cP) AIR MASSES & WEATHER Continental polar (cP) From northern Canada and interior of Alaska Winter very cold, dry Summer cool, dry Responsible for lake-effect snows Mass crosses the Great Lakes

AIR MASSES & WEATHER Maritime polar (mP) From North (P)acific & (A)tlantic Oceans Winter (P) mild, humid (A) cold, humid Summer (P) mild, humid (A) cold, humid Influence in the northeastern & western United States causing cold temperatures and snow

Continental tropical (cT) AIR MASSES & WEATHER Continental tropical (cT) From Southwest and Mexico Winter warm, dry Summer hot, dry

Maritime tropical (mT) AIR MASSES & WEATHER Maritime tropical (mT) From the Gulf of Mexico and the Atlantic Ocean Winter warm, humid Summer hot, humid Eastern USA Usually unstable!