Science Ch.16 Weather

Front 1

weather

Back 1

state of the atmosphere at a specific time and place, determined by factors including air pressure, amount of moisture in the air, temperature, wind, and precipitation

Front 2

humidity

Back 2

amount of water vapor held in the air

Front 3

relative humidity

Back 3

measure of the amount of moisture held in the air compared with the amount it can hold at a given temperature; can range from 0% to 100%

Front 4

dew point

Back 4

temperature at which air is saturated and condensation forms

Front 5

fog

Back 5

a stratus cloud that forms when air is cooled to its dew point near the ground

Front 6

precipitation

Back 6

water falling from cloud-including rain, snow, sleet, and hail-whose form is determined by air temperature

Front 7

air mass

Back 7

large body of air that has the same characteristics of temperature and moisture content as the part of Earth's surface over which it formed

Front 8

front

Back 8

boundary between two air masses with different temperatures, density, or moisture; can be cold, warm, occluded, and stationary

Front 9

tornado

Back 9

violent, whirling windstorm that crosses land in a narrow path and can result from wind shears inside a thunderhead

Front 10

hurricane

Back 10

large, severe storm that forms over tropical oceans, has winds of at least 120km/h, and loses power when it reaches land

Front 11

blizzard

Back 11

winter storm that lasts at least three hours with temperature of -12 degrees Celsius, poor visibility, and winds of at least 51km/h

Front 12

meteorologist

Back 12

studies weather and uses information from Doppler radar, weather satellites, computers, and other instruments to make weather maps and provide forecasts

Front 13

station model

Back 13

indicates weather conditions at a specific location, using a combination of symbols on a map

Front 14

isotherm

Back 14

line drawn on a weather map that connects points having equal temperature

Front 15

isobar

Back 15

lines drawn on a weather map that connect pints having equal atmospheric pressure; also indicate the location of high- and low- pressure areas and can show wind speed