How can we help?

You can also find more resources in our Help Center.

21 terms

16-1 What is Weather?

STUDY
PLAY
Weather
the description of the state of the atmosphere at a specific time and place. This is the result of heat and Earth's air and water.
Temperature
how fast the molecules move. High = fast movement, low= slow movement
high temps=low pressure
wind
air moving in a specific direction
humidity
the amount of water vapor in the air
* warm air can hold more moisture*
relative humidity
the measure of the amount of water vapor in the air compared to the amount needed for saturation at a specific temperature. When relative humidity is 100 then the air is saturated.
dew point
the temperature at which air is saturated and condensation forms. This changes with the amount of water vapor in the air. Measured with a psychrometer (dry bulb and wet bulb)
clouds
objects that form as warm air rises, expands, and then cools. classified by shape and height
precipitation
water falling from clouds
types of precipitation
rain, snow, sleet, hail
sleet
rain drops that pass through a layer of frozen air near Earth's surface forming pellets. (first rain then ice)
hail
precipitation in the form of lumps of ice. They form in cumulonimbus clouds and they can be very dangerous.
fog
a stratus cloud that forms near the ground when air is cooled to its dew point.
stratus
height - low
shape- layered
weather- fair weather or light rain/snow
cumulus
height- middle or high
shape- puffy, cotton balls
weather- fair or thunderstorms
cirrus
height- high
shape- feathery, wispy
weather- fair or storms may be coming
nimbus
means "dark rain cloud"
cumulonimbus
when a cumulus clouds grows into a thunderstorm. Cloud is very dark on the bottom. Sometimes called a thunder cloud. Can produce thunderstorms, hail, and tornadoes.
nimbostratus
very high clouds that can bring long, steady rain or snow
cirro
high
alto
middle
strato
low