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ch 16 wther patterns

6th grade Ch 16 Weather Patterns

air pressure the force of air molecules pushing on an area
barometer any instrument tht measures air pressure
weather the condition of Earth's atmosphere at a particular time and place
wind air that moves horizontally or parallel to the ground
global winds winds that travel thousands of kilometers in steady patterns and last for weeks
Coriolis effect the influence of the earth's rotation on winds and other moving objects over the Earth
doldrums low pressure zone near the equator
horse latitudes high pressure zones located about 30 degrees north and 30 degrees south of the equator
trade winds blow from the east, moving from the horse latitudes toward the equator
westerlies blow from the west, moving from the horse latitudes toward the poles
easterlies blow from the east, moving from the polar regions toward the mid latitudes
stormy weather occurs when cold air of the easterlies meets the warmer air of the westerlies
westerlies bring storms across much of the US
horse latitudes causes weather to be clear and dry
jet streams usually lfow in the upper troposphere from west to east for thousands of kilometers
sea breeze caused by warmer air rising over the land during the day and cooler air blowing from the water
land breeze cooler air blows out from the land and warmer air rises over the water at night
winter monsoon occur in regions where the land cecomes much cooler than the sea during the winter
summer monsoon low pressure builds over the land and warm, moist air comes onto land
evaporation the process by which a liquid changes into a gas
energy what is needed for water to evaporate
condensation the process by which a gas, such as water vapor, changes into a liquid
condensation occurs when moist air cools
precipitation any type of liquid or solid water that falls to Earth's surface
humidity the amount of water vapor in the air
saturation a condition in which the rates of evaporation and condensation are equal
unsaturated air more water evaporates into the air than condenses back into the water
saturated air amount of water that evaporates equals the amount that condenses
relative humidity compares the amount of water vapor in air with the maximum amount of water vapor that can be present at that temperature
dew point the temperature at which air with a given amount of water vapor will reach saturation
clouds condensed water vapor
cirrus appear feathery and wispy
cirrus "curl of hair"
cumulus "heap" or "pile"
cumulus can grow very tall
stratus "spread out"
stratus form in flat layers
cirrus form in very cold air at high altitudes
cirrus made of ice crystals
cumulus fluffy white clouds with darker bases
cumulus look like cotton balls
cumulus if they continue to grow taller, they can produce a brief shower
cumulonimbus talles clouds and are called thunderheads, can produce heavy rainfall
stratus causes the sky to look gray
stratus produce steady light precipitation
fog a cloud that rests on the ground or body of water
fog a thick mist formed by water vapor in the air condenses as it cools
precipitation forms from water droplets or ice crystals
precipitation comes from clouds
precipitation formed through the combining of cloud droplets
precipitation form through the growth of ice crystals
rain guage used to measure precipitation
long ruler used to measure snow depth
rain or drizzle most common type of precipitation
raindrops form from liquid cloud droplets or from ice crystals taht melt as they fall
drizzle a light rain with very small drops
drizzle usually comes from stratus clouds
freezing rain raindrops frozen when they hit the ground or other surface
freezing rain covers surfaces with a coating of ice
sleet small pellets of ice that form when rain passes through a layer of cold air
snowflake have six sides or branches
snow formed as ice crystals grow and merge in clouds
hail largest type of frozen precipitation and ofen occurs in warm weather
hail lumps or balls of ice that fall from cumulonimbus clouds
acid rain rain that becomes more acidic than normal because of pollution
acid rain caused by factories, automobiles, natural sources of released sulfur dioxide and nitrogen oxides
air pressure decreases as you move higher in the atmosphere
winds blow from areas of high pressure toward areas of low pressure
Earht's rotation causes long distances wind to bend or curve
Created by: fhershey