16-1 What is Weather?

21 terms by misskrone

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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

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