Does Weather Control Your Life???

Weather Weather- condition of the atmosphere at a certain time and place. Weather Characteristics: Heat energy Air pressure Winds Moisture

Weather Data Collection 3 Ways Weather is Determined Weather Satellites- take pictures of clouds and storms from above the earth Radar (Radio Detecting and Ranging)- sends out signals that are reflected from objects (rain, clouds, etc.) Weather Stations-More than 400 in the U.S.

Air Masses Air Mass- a large body of air with a certain temperature and moisture Maritime tropical-forms over the tropical ocean & warm and moist Maritime polar-forms over northern ocean & cold and moist Continental tropical- made of hot, dry air Continental polar- made of cold, dry air

Weather Fronts Front- leading edge of air mass Cold Front- bring violent storms followed by cool weather Warm Front -bring rain and showers with warm humid air Occluded Front- make light rain Stationary Front- bring many days of rain

Air Pressure Air Pressure=Barometric Barometric Pressure-measure of weight of air pressing on earth’s surface. General Characteristics: Falling Pressure- stormy weather Rising Pressure-fair weather coming Steady Pressure-continue weather

Wind Wind-Moving air Made from differences in air pressure The greater difference in air pressure the faster the wind Weather Vane- changes points to show the direction of the wind Anemometer- measures wind speed

Humidity Humidity- the moisture in the air Relative Humidity- a comparison of the amount of water vapor in the air to the greatest amount it could hold at that temperature. Given as a % that is possible Saturated- when the air is as full as possible with water

Dew Dew- water vapor that has condensed on a surface into water Dew point- the temperature needed for the air to condense Dew depends on 2 factors.. Air temperature near the surface Amount of water in the air

Tornado Tornado- a violent rotating column of air Develop from a Thunderstorm Water Spout-weak tornado over the water

Before thunderstorms develop, a change in wind direction and an increase in wind speed with increasing height creates an invisible, horizontal spinning effect in the lower atmosphere. Rising air within the thunderstorm updraft tilts the rotating air from horizontal to vertical. An area of rotation, 2-6 miles wide, now extends through much of the storm. Most strong and violent tornadoes form within this area of strong rotation

Hurricane

Hurricane Few Interesting Facts: All hurricanes circle around an “eye” (The center of the storm) The center of the storm is the calmest part They can be up to 600 miles across The winds travel from 75-200 mph

Weather Interactive Current Weather Map

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