1
basic cause of all weather
the sun
scientist who studies weather
meteorologist
warm air is ( lighter, heavier) than cool air
lighter
how fast does the earth's surface spin
1,000 mph
what causes different seasons
the tilt of earth's axis
line that goes from the North Pole to the South Pole
axis
what is frost
water vapor that condenses and forms frozen water on the ground
relative humidity
amount of water that air can hold at a given temperature
condensation
when water vapor leaves the air and changes into liquid water
air becomes saturated when the humidity is at what percent
100%
dew point
lowest possible temperature at which air is able to hold all of its water vapor
dew
water vapor that condenses to form liquid water of the ground
ice crystal in the cloud becomes to heavy, falls, melts, and lands on the earth as liquid water
rain
falling ice crystals melt, hit the earth as liquid rain, but refreeze as soon as they land
freezing rain
a small piece of ice is tossed up and down inside a cloud, forming several layers of ice, until it is to heavy and falls to earth
hail
falling ice crystals melt into raindrops then refreeze and land on earth as tiny pieces of ice
sleet
falling ice crystals melt slightly, stick, and freeze together into snowflakes
wet snow
where does the air we live in receive most of its warmth from
ground
layers of flat clouds
stratus
term that describes a cloud that rain falls from
nimbus
clouds made of small ice crystals
cirrus
puffy, bulgy clouds
cumulus
wispy, curly clouds
cirrus
sheets of cloud that produce rain
stratus
thunderhead is another name for which cloud
cumulonimbus
broad flat top of a cumulonimbus cloud
anvil top
what do opposite electrical charges built up in tall clouds produce
lighting
rapid expansion of superheated air cause shock waves so that we hear ? .
thunder
tornado warning
a warning for when a tornado has been spotted
step leader
thin channel of charged air through which a lighting bolt can travel
calm region of of low air pressure in the center of a tornado
eye
storm that packs destructive power into the smallest space
tornado
sheet lighting
lighting bolts that do not come into contact with the ground but remain within the cloud
front
boundary between two air masses
row of thunderheads that build up in the front of advancing cold air
squall line
what are 7 percautions you should take in a thunderstorm
1. be indoors
2. a car is a safe place to be
3. if outside, avoid being the tallest thing
4. stay away from hight ground, or open flat areas
5. stay away from tall objects such as trees
6. avoid being in or near water
7. do not use the telephone or electrical appliances