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80 Cards in this Set
- Front
- Back
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PREDICTING:
low pressure area |
areas of storms and precipitation
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huge body of air that has similar temp, humidity, and air pressure throughout is called
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air mass
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In the U.S. weather systems typically move from ____ to ____
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west east
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PREDICTING:
air pressure falling |
change in weather is coming usually precipitation
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PREDICTING:
high pressure area |
area of clear dry weather
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PREDICT:
cirrus cloud |
wind
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PREDICT:
cumulonimbus |
thunder rain hail and tornadoes
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PREDICT:
nimbostratus |
rain snow
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Air masses move from areas of ___ ______ to areas of ___ _____
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high pressure
low pressure |
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_____ is a weather event that can cause dramatic change
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El Nino
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warm water flows in the Pacific Ocean toward the west coast of South America every 2-7 years to cause
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droughts in Asia and Brazil
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___ rain in California and Peru and ____ in Florida and southwest U.S.
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heavy
tornadoes |
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PREDICTING:
air pressure rising |
weather is clearing
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lines that connect areas of similar are pressure ______
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isobars
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lines that connect areas of similar temp
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isotherms
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PREDICT:
stratus |
fog
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____ is a scientist who studies weather and tries to predict it
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meteorologist
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meteorologist use a _____ ___ as an important tool
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weather map
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A ____ combines info about many aspects of weather for an area
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weather map
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LABELS:
high pressure |
H
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LABELS:
low pressure |
L
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What is used to symbol a cold front on a weather map
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blue triangles
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how is a cold front formed
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cold air moves under the warm air causing the warm air to rise
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the result of a cold front
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move quickly bring cold dry air
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what is used to symbol a warm front on a weather map
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red half circles
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how is a warm front formed
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warm air moves over cold air
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results of a warm front
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move slowly bring warm humid air
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how is a stationary front formed
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cold and warm air masses meet but neither has enough force to move the other so they get stuck
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results of stationary front
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several days of clouds and precipitation
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symbol used to represent a stationary front
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half red circles on one side and blue triangles on the other
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how is a occluded front formed
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a warm air mass is caught between 2 cooler air masses; the warm air mass is cut off (occluded) from the ground
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results of occluded front
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clouds and precipitation
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symbol used for an occluded front
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blue triangles and red half circles on one side
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name 4 types of fronts
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warm cold occluded stationary
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if air masses have different temps and densities they do
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not mix
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the area where they do not mix is called a
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front
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what is preciptitation
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any form of water that falls from clouds and reaches earth's surface
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true or false
all clouds form precipitation |
no
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rain
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.5 mm in diameter at least
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sleet
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ice particles smaller than 5 mm in diameter
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hail
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ice pellets larger than 5 mm in diameter
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snow
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ice crystals
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true or false
the most common kind of rainfall is snow |
no rain
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how do mist and drizzle than rain
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smaller particles than rain
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DESCRIBE:
cumulus |
about 2-18 km above surface
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DESCRIBE:
stratus |
2-6 km above surface
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DESCRIBE:
cirrus |
more than 6 km above surface
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DESCRIBE:
fog |
at or near the surface
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looks like fluffy piles of cotton
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cumulus clouds
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form in flat layers
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stratus
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looks wispy and feathery
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cirrus
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the process by which water molecules in liquid water escape in the air is called
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evaporation
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what is the water cycle
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the movement of water between the atmosphere and earth's surface
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the measure of the amount of water vapor in the air is
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hunidity
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what is relative humidity
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the percentage of water vapor in the air compared to the maximum amount air could hold
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relative humidity is
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a percentage and it depends on air temperature
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how does evaporation of moisture from your skin help keep you comfortable on a hot day
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evaporation removes heat form your skin to keep you comfortable
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true or false
clouds form when water vapor in the air becomes liquid water or ice crystals |
true
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process by which molecules of water vapor become liquid water
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condensation
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temp at which condensation beigns
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dew point
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water that condenses from the air onto a cold surface
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frost
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why do ice storms cause power failures
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they will stick to the power lines
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raindrops freeze into tiny particles of ice as they fall through the air
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sleet
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raindrops freeze after they hit the ground and other surfaces
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freezing rain
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ice pellets add layers of ice as they are carried up and down in a storm cloud
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hail
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water vapor in a cloud is converted directly into ice crystals
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snow
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what damage can large hailstones do
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damage crops cars buildings anything
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meteorologists measure rainfall with a
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rain gauge
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true or false
on avg 10 cm of snow contains about the same amount of water as 5 cm of rain |
false
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long periods of unusually low precipitation are called
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droughts
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water vapor in a cloud is converted directly into ice crystals
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snow
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what damage can large hailstones do
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damage crops cars buildings anything
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meteorologists measure rainfall with a
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rain gauge
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true or false
on avg 10 cm of snow contains about the same amount of water as 5 cm of rain |
false
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long periods of unusually low precipitation are called
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droughts
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water vapor in a cloud is converted directly into ice crystals
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snow
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what damage can large hailstones do
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damage crops cars buildings anything
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meteorologists measure rainfall with a
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rain gauge
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true or false
on avg 10 cm of snow contains about the same amount of water as 5 cm of rain |
false
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long periods of unusually low precipitation are called
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droughts
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