weather - weeblycourtneyjennings.weebly.com/uploads/1/3/3/7/...weather_vocabulary.pdf · weather...
TRANSCRIPT
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WEATHER The state of the atmosphere and its short term variations as defined by various weather elements, most notably, temperature, wind, humidity, cloudiness, visibility and precipitation, and storminess.
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Condensation
• The process by which water vapor cools and becomes a liquid.
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Weather Symbols
• The state of the atmosphere at a given time and place, with respect to variables such as temperature, moisture, wind velocity, and barometric pressure
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Water Vapor • water in the gaseous state caused by
evaporation
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Evaporate • when the sun heats up liquid surface water and turns
it into gaseous water vapor. The water vapor rises and becomes part of the atmosphere
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Water • Water vapor is water in its gaseous state-
instead of liquid or solid (ice). Water vapor is totally invisible. If you see a cloud, fog, or mist, these are all liquid water, not water vapor.
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Clear Skies
• Sky with no cloud cover
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Moderate temperature
• Not extremely hot or cold, temperature with in a mild range
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The force that pulls objects toward
each other
Gravity
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Tropical Waters
• Ocean waters within 23 degrees latitude of the equator. In the western Atlantic, these waters are warm year-round. When a hurricane is moving through these waters, it is considered a tropical cyclone.
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Precipitation
• water that falls to the ground as rain, snow. sleet, or hail
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Severe Weather
• any dangerous meteorological phenomena with the potential to cause damage, serious social disruption, or loss of human life such as hurricanes or tornadoes
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Ocean Water
• The salt water in or coming from the sea or ocean. Ninety seven percent of our water is saltwater.
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Thunderhead • a cumulonimbus cloud seen during a
thunderstorm
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CLIMATE The composite pattern of long-term weather conditions that can be expected in a given region. Climate refers to yearly cycles of temperature, wind, rainfall, etc., and not to daily variations (see "weather").
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HIGH PRESSURE
Air Pressure System
Cause
Weather associated with
this pressure system
High Pressure (H)
Cool, sinking air moving in
a clockwise direction
Dry, clear weather
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LOW PRESSURE
Air Pressure System
Cause
Weather associated with
this pressure system
Low Pressure (L)
Warm, rising air moving in
a counterclockwise
direction
Moist air, clouds, rain,
possible thunderstorms
and tornadoes
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WARM FRONT (air mass/air front)
Warm air replaces cooler air. Light to moderate rain; warmer more humid temperatures after frontal passage
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COLD FRONT (air mass/air front)
Advancing cold air replaces warm air. Frequent rain with possible thunderstorms. Cooler temperature and drier air after frontal passage.
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TORNADOES
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The shaking of Earth’s crust caused by rock slabs moving against each other.
Earthquake
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HURRICANE Seasonal storm that usually forms from low pressure areas over the warm (over 80°), tropical ocean waters of the western Atlantic
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A large wave produced by an earthquake,
volcano, or landslide
Tsunami
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OCCLUDED FRONT A warm front is overtaken by a cold front. Severe snowstorms in the northeastern United States.
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STATIONARY FRONT Air masses on either side of the boundary are not moving or are barely moving. Cloudy, overcast, some light showers or drizzle. Conditions do not change until another system moves through.
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JETSTREAM A(n) jet stream is a narrow band of high winds that are commonly near the top of the troposphere. -Jet streams flow from the west at up to 300 km/h, pushing weather systems from W to E in the United States.
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PREVAILING WINDS
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SEA BREEZE
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LAND BREEZE
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HUMIDITY The amount of water vapor (gas) in the air. Measured in grams of water per cubic meter of air. Tool – psychrometer
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MARITIME POLAR AIR MASS Where are they from - over northern Atlantic and Pacific Oceans
Characteristics - contain cold, humid air; often bring cloudy, rainy weather
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CONTINENTAL TROPICAL AIR MASS
Where are they from - over dry deserts near the equator
Characteristics - contain hot, dry air; bring clear skies and high temperatures
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MARITIME TROPICAL AIR MASS
Where are they from - over water near the equator Characteristics - contain hot, humid air; often bring rain or snow
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CONTINENTAL POLAR AIR MASS
Where are they from - in polar regions in the interior of Canada and Alaska Characteristics - contain cold, dry air; bring cold temperatures in winter and cool weather in summer
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CONDUCTION the transfer of energy from one molecule directly to another
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CONVECTION Transfer of energy through a fluid. Hot fluids rise, cold fluids sink.
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EL NINO warm ocean current appearing annually around Christmas time along the coast of Ecuador and Peru and lasting only a few weeks to a month or more.
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Equator