16-1 What is 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.
how fast the molecules move. High = fast movement, low= slow movement
high temps=low pressure
air moving in a specific direction
the amount of water vapor in the air
warm air can hold more moisture
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.
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)
objects that form as warm air rises, expands, and then cools. classified by shape and height
water falling from clouds
types of precipitation
rain, snow, sleet, hail
rain drops that pass through a layer of frozen air near Earth's surface forming pellets. (first rain then ice)
precipitation in the form of lumps of ice. They form in cumulonimbus clouds and they can be very dangerous.
a stratus cloud that forms near the ground when air is cooled to its dew point.
height - low
weather- fair weather or light rain/snow
height- middle or high
shape- puffy, cotton balls
weather- fair or thunderstorms
shape- feathery, wispy
weather- fair or storms may be coming
means "dark rain cloud"
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.
very high clouds that can bring long, steady rain or snow