Chapter 5 Vocabulary Section 1. Chapter 5 Vocabulary Section 1.
Chapter 9: Weather Vocabulary
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Transcript of Chapter 9: Weather Vocabulary
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Chapter 9: WeatherVocabulary
Topic 7 in Textbook/WorkbookPage 126
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Assignment• Due Friday April 11th
• All 30 vocabulary words –Words and definitions are to be copied onto
loose leaf.• 7 Vocabulary Words illustrated– You may pick 7 of the vocabulary words to
explain using a picture. Typed vocab words & clip art pictures will not be accepted.This assignment will count as a test grade!
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Example
Precipitation
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VOCABULARY WORDS
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Air MassA large body of air in the troposphere with similar characteristics of pressure, moisture, and temperature
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Air Pressure GradientThe change in air pressure over a given area.
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AnemometerA weather instrument used to measure wind speed.
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Atmospheric, Barometric, or Air Pressure
• The weight of the overlying atmosphere pushing down on a given unit of area.
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Atmospheric TransparencyHow transparent the atmosphere is to insolation; how easily can insolation pass through the air.
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BarometerAn instrument used to measure air pressure
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Cloud Cover• The fraction or percent of the total
sky at a location that is covered by clouds.
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Cold Front• The interface of an advancing cold
air mass and a warmer air mass.
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Cyclone• A low-pressure portion of the
troposphere that has air moving towards its center. Rotates counterclockwise. Includes: hurricanes & tornadoes, also called a low.
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Cyclonic stormA large type of low-pressure storm system formed in the mid-latitudes.
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Dew PointThe temperature at which the air becomes saturated with water vapor and the relative humidity is 100%
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FrontThe interface between two air masses of different characteristics.
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HumidityThe water vapor in the atmosphere
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IsobarAn isoline used on weather and climate maps that connect points of equal air pressure.
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Jet Stream• A concentrated curving band of high
speed, easterly moving winds usually at the top of Earth’s troposphere.
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MonsoonCyclic and extreme weather changes caused by the shifting wind and pressure belts. Common in southwest Asia
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Occluded front• The boundary of opposing wedges of
cold air masses formed when a cold front overtakes a warm front, lifting the warm air mass of Earth’s surface, forming mid-latitude cyclones
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Planetary wind beltEast-west zones on Earth where the wind blows from one direction much of the time. AKA prevailing winds.
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Polar FrontAn ever-changing boundary between the colder air masses toward the poles and the warmer air masses toward the middle latitudes.
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PrecipitationFalling liquid or solid water from clouds toward Earth’s surface.
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ProbabilityThe chance of some environmental event, such as rain or an earthquake occurring.
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PsychromotorAn instrument that is used to indirectly measure the amount of water vapor in the air, such as a sling psychrometer
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RadarAn instrument that uses radio/microwave electromagnetic radiation to observe many weather features such as precipitation, tornadoes, and hurricanes
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Relative humidityThe ratio of the amount of water vapor in the air to the maximum amount it can hold
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Stationary FrontA weather condition in which the boundary between two air masses remains in the same position
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Station ModelCities and other weather station sites on weather maps represented by circles, with symbols in and around each circle that indicate the many weather variables.
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TroposphereThe part of the atmosphere immediately above Erath’s surface; where most weather changes occur.
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VisibilityThe farthest distance at which one can see a prominent object at Earth’s surface with the naked eye; decreased by fog, air pollution, and precipitation.
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Warm FrontThe boundary of an advancing warm air mass and a retreating wedge of a cooler air mass; characterized by a gentle slope, long periods of precipitation, and strato (layered) clouds.
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Water VaporGaseous water in the atmosphere; also called moisture or steam.
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Weather VariablesCondition of the atmosphere such as temperature, air pressure, wind, moisture conditions, cloud cover, precipitation, and storms.