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Weather Mr. Skirbst Weather The condition of the… atmosphere in terms of heat, pressure, wind, and moisture Atmosphere: - a mixture of gases surrounding the Earth Heat Energy -The source of most heat in the atmosphere is the SUN Heat Energy - Heat is spread in 3 ways: Heat Energy 1. Radiation – transfer by waves Heat Energy 1. Radiation – transfer by waves 2. Conduction – by contact Heat Energy 1. Radiation – transfer by waves 2. Conduction – by contact 3. Convection – by fluid (air too) Greenhouse Effect Greenhouse Effect Heat is trapped by the atmosphere Global Variations Global Variations COLD HOT COLD Air Pressure - Force of atmosphere pushing on the Earth’s surface Air Pressure - Force of atmosphere pushing on the Earth’s surface - Depends on air’s density Factors Affecting Pressure Factors Affecting Pressure 1. Temperature: Factors Affecting Pressure 1. Temperature: - as temp increases, air pressure decreases Factors Affecting Pressure 2. Water Vapor: (moisture in air) Factors Affecting Pressure 2. Water Vapor: (moisture in air) - as water vapor increases, air pressure decreases Factors Affecting Pressure 3. Altitude: (elevation) Factors Affecting Pressure 3. Altitude: (elevation) - as altitude increases, air pressure decreases Barometer Instrument that measures air pressure Wind Air movement due to differences in air pressure (from unequal heating) 2 Types of Wind 1. Local Wind (short distances) 2 Types of Wind 1. Local Wind (short distances) Sea breeze – from sea to land 2 Types of Wind 1. Local Wind (short distances) Sea breeze – from sea to land Land breeze – from land to sea 2 Types of Wind 2. Global Wind (long distances) Anemometer Instrument used to measure wind speed Moisture in the air Relative Humidity: a measure of the amount of moisture Moisture in the air Relative Humidity: a measure of the amount of moisture % RH = moisture in air moisture air can hold Psychrometer instrument used to measure humidity (water vapor) Clouds Collection of condensed moisture (on dust) Types of Clouds Types of Clouds 1. Cumulus – white, tall and fluffy Types of Clouds 2. Stratus – grey, flat and layered Types of Clouds 3. Cirrus – feathery, high + wispy 5 Types of Precipitation Rain Warm Warm Warm 5 Types of Precipitation Rain (warm, warm, warm) 5 Types of Precipitation Rain Snow Cold Cold Cold 5 Types of Precipitation Rain Snow Sleet Warm Cold Cold 5 Types of Precipitation Rain Snow Sleet Hail Cold Warm Cold W I N D 5 Types of Precipitation Rain Warm Snow Sleet Warm Hail Freezing rain Cold Weather Forecasting Symbols: Cold Front Warm Front Stationary Front Occluded Front Psychrometer instrument used to measure humidity (water vapor)
