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Download CHAPTER 15 WEATHER - Clearview Regional High School District
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CHAPTER 16 WEATHER Weather- Present state of atmosphere 16.1 Factors - Temp, air pressure, wind - Water cycle- basis of weather Wind - Created from uneven heating - Wind speed measured by anemometer Humidity - Amount of water vapor in air *Warm air holds more than cold Relative Humidity - Water vapor in air vs. how much air can hold at a certain temp. Dew point - Temp at which condensation takes place Cloud Formation 1. Warm air rises & expands 2. Water vapor condenses around dust 3. Droplets of water form clouds Cloud Classification - Shape & height Shape . 1. 2. 3. 4. Stratus- Flat, gray, precipitation Cumulus- White, puffy, tall Cirrus- Feathery/fair weather Nimbus- Rain cloud Stratus Fog (Stratus) Cumulus Cumulonimbus Cirrus Nimbus Height 1. Cirro = High (18,000 + feet) 2. Alto = Middle (6,500 -18,000 feet) 3. Strato = Low (Up to 6,500 feet) 16.2 Weather Patterns Fronts http://ww2010.atmos.uiuc.edu/(Gh)/guides/crclm/act/fpr.rxml - Boundary between 2 different air masses - Storms occur here Fronts 1. Cold- Cold air pushes warm air up 2. Warm- Warm air slides over cold 3. Occluded- Warm air between cool and cold air 4. Stationary- Fronts stop moving Cold Front Warm Front Occluded Front Stationary Front Severe Weather Thunderstorms - Warm, moist air rises rapidly & cools - Strong winds, thunder, lightning Tornadoes - Form along fronts - Warm air rises up creates funnel Hurricanes - Forms over tropical oceans - Heat energy from ocean turns to wind 16.3 Forecasting Weather Weather Info 1. Station model http://weather.cod.edu/notes/stnmodel.html 2. Isobar- Wind 3. Isotherm- Temperature
