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57 Cards in this Set

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Condition of the atmosphere at a particular time and place
weather
Condition of the atmosphere at a particular time and place
weather
continuous movement of water from water sources, such as lakes and oceans into the air, onto and over land into the ground and back to the water sources
Stages of water cycle
liquid water nchanges into water vapor, which is a gas
evaporation
plants release water vapor into the air through their leaves
transpiration
water, usually from precipitation what flows across land and collects in rivers, streams and the ocean
runoff
when rain, snow, sleet or hail falls from the clouds onto the earth’s surface
precipitation
amount of water vapor or moisture in the air.
humidity
the amount of moisture the air contains compared with the maximum amount it can hold at a particular temperature.
relative humidity
measures relative humity. Consists of two thermometers. One is wet bulb, one is dry bulb. The difference in the two is the relative humidity
psychometer
the temperature to which air must cool to be completely saturated.
dewpoint
collection of millions of tiny water droplets or ice crystals. The form as warm air rises and cools.
cloud
puffy, white with flat bottoms. When warm air rises, indicate fair weather. When they get larger they produce thunderstorms.
cumulus cloud
form in layers. Cover large areas of the sky, often blocking out the sun.
stratus
dark stratus clouds that produce light to heavy, continuous rain
nimbostratus clouds
thin, feathery, white clouds found at high altitudes. Form when wind is strong. Indicate approaching bad weather if they thicken and lower in altitude
cirrus clouds
When the water vapor condenses near the ground it forms a stratus cloud called
fog
means that precipitation might fall from the cloud cumulus cloud.
cumulonimbus
prefix for clouds in high altitude
cirro made of ice crystals
Prefix for clouds in middle altitudes:
Alto can be made up of both water droplets and ice crystals
Prefix for clouds in low altitudes:
strato Made up of water droplets
water, in solid or liquid form that falls from the air to the earth.
precipitation
Most common precipitation
Rain: Liquid water falls from clouds to earth
Most common solid
Snow
4 types of precipitation
rain, snow, sleet and hail
freezing rain. Forms when rain falls through a layer of freezing air. The rain freezes producing falling ice
sleet
solid precipitation that falls as balls or lumps of ice. Forms in cumulonimbus clouds
Hail
used to measure the amount of rainfall
rain gauge
a large body of air that has similar temperature and moisture throughout.
Air mass
Two letters of air mass:
first letter represents what characteristic
moisture
Two letters of air mass:
second letter is what characteristic
temperature
Explain what the letters mean in relationship describing air mass
m
c
p
t
m: maritime forms over water wet
C: continental forms over land
dry
p forms over the polar gions Cold
t develops over the tropics warm
the boundary that forms between two different air masses. Weather is usually cloudy and stormy in a front.
front
four types of weather fronts
cold, warm, occluded front, stationary front
Cold air mass meets and displaces a warm air mass., produces thunderstorms, heavy rain or sonw.
cold front
warm air mass meets and overrides a cold air mass. Warm air gradually replaces the cold air.
warm front
fast moving cold air mass overtakes a slow moving warm air mass and forces the warm air up. Cool temperatures and large amounts of precipitation
occluded front
cold air mass meets a warm air mass and little horizontal movement occurs. Weather is similar to warm front.
stationary front
Why do fronts occur in middle latitudes?
Because there are both cold and warm air masses. In the tropics there is only warm air masses
weather that can cause property damage and even death.
Severe weather
small intense weather systems that produce strong winds, heavy rain, lightning and thunder. Warm moist air rises rapidly in an unstable environment
thunderstorms
large electrical discharge that occurs between two oppositely charges surfaces.
lighteneing
the sound that results from the rapid expansion of air along the lightning strike
thunder
small, rotating column of air that has high wind speeds and low central pressure and that touches the ground.
tornado
large rotating tropical weather system with wind speeds of at least 119 km/h
Hurricane
Hurricanes turn which way in the northern hemisphere
counterclockwise
Hurricanes turn which direction in the southern hemisphere
clockwise
Parts of a hurricane
eye: center of hurricane, core of warm calm air with low winds

Eye wall: strongest part of the hurricane. Surrounds the eye. Heavy rains and forceful winds up to 300 km

Rain bands beyond the eye wall, spiraling bands of rain and high winds. The winds decrease the further away from eye wall
a wall of water tat builds up over the ocean due to the heavy winds and low atmospheric pressure. Gets bigger and bigger as it nears shore.
Storm surge
prediction of weather conditions over the next 3-5 days
weather forcast
measures temperature
thermometer
measures air pressure
Barometer
anemometer
instrument that measures wind speed
measures direction of wind
windsock or windvane
3 ways weather is measured in upper atmosphere:
weather balloons
radar
weather satellites
lines on a weather map that connect points of equal air pressure. Closed circles mean high or low pressure
isobars
isobars
lines on a weather map that connect points of equal air pressure. Closed circles mean high or low pressure