Weather
What is weather?
The condition of the Earth's atmosphere at a certain time and place.
What are clouds?
A small collection of water droplets suspended in air.
What is a weather front?
A boundary between air masses.
What happens in a high-pressure system?
In a high-pressure system, air sinks and warms.
What is a jet stream?
A narrow, variable band of very strong, predominantly westerly air currents encircling the globe several miles above the earth.
What is humidity?
Amount of water vapor in the air.
How much percent of sunlight do clouds reflect?
25%.
What is a cold front?
When cold air pushes warm air upwards, it creates a cold front.
What are the effects of a high-pressure system?
Clear weather.
What directions do jet streams move?
West to East.
Explain dew point.
When condensation equals evaporation.
When altitude increases, __________ decreases.
Air pressure
How are warm fronts formed?
When warm air masses chase retreating cold air masses.
What is a low-pressure system?
When air rises and cools.
Name 2 jet streams.
Polar and subtropical.
Define at least 3 types of precipitation.
Rain, snow, sleet, hail.
Where do clouds form?
Cloud condensation nuclei
How are stationary fronts formed?
When both air masses stop moving.
What are the effects of a low-pressure system?
Cloudy, rainy weather.
How do jet streams help planes?
If a plane is heading west to east, its flight will be faster.
How does wind move?
Horizontally.
Define frontal lifting.
Warm air mass over cold air mass.
What weather do cold fronts give off
Rain & snow.
If a place is sunny, what is the pressure system?
High pressure system
How does the polar jet stream affect weather?
It can bring warm air from USA to Canada