layer of gases that surrond the earth.
force exerted by the weight of a column of air on a surface
instrument used to measure air pressure
Pressure center where the pressure has been measured to be the lowest relative to its surrondings.
Pressure center where the pressure has been measured to be the highest relative to its surrondings.
Layer closest to Earth, where almost all weather occurs; the thinnest layer
Layer of the atmosphere that lies between the troposphere and the mesosphere and in which temperature increases as altitude increases; contains the ozone layer
the layer of the atmosphere between the stratosphere and the thermosphere and in which temperature decreases as altitude increases:air moves at high rate of speed. Meteors burn here.
outermost layer and hottest layer of the atmosphere
Not a true layer of the atmosphere - an extension of the thermosphere that contains regions of charged particles
condition of the atmosphere at a particular place at a particular time
Study of Earth's atmosphere
Scientist who studies earth's atmosphere
a huge body of air that has similar temperature, humidity, and air pressure at any given altitude
warm air mass overtakes a cold air mass, usually causing rain, moves slowly
cold, dense air overtakes a warm air mass, forcing warm moist air up, usually resulting in a thunderstorm, moves fast
boundary formed when two different air masses meet
a front where a warm air mass is caught between two colder air masses and brings cool temperatures and large amounts of rain and snow
a boundary between air masses that don't move possibly causing rain for several days
maritime tropical air mass
formed over a body of water in an area that is warm; warm, moist unstable air
maritime polar air mass
formed over body of water in an area that is cold; cool,moist, unstable air
continental tropical air mass
formed over land in an area that is warm; hot, dry, stable air
continental polar air mass
formed over land in an area that is cold; cold, dry, stable air
invisible gas in the air responsible for moisture in the air
actual amount of water vapor in the air; depends on temperature of the air.
the ratio of the amount of water in the air at a give temperature to the maximum amount it could hold at that temperature
the temperature at which the water vapor in the air becomes saturated and condensation begins
relative humidity formula
actual amount of water vapor in the air/ amount of water vapor the air can hold (saturation) X 100
a brilliant electric spark discharge in the atmosphere, occurring within a thundercloud, between clouds, or between a cloud and the ground.
a booming or crashing noise caused by air expanding along the path of a bolt of lightning
a rapidly whirling, funnel-shaped cloud that reaches down from a storm cloud to touch earth's surface
This is an alert issued when weather conditions are right for a tornado.
a tornado has actually been spotted or detected by radar- seek shelter
A scale that tells how severe a tornado is based on wind speed and the damage being caused.
a storm that forms over warm, tropical ocean waters with winds of at least 119 km/hr
a ring of thunderstorm clouds that produce heavy rain and very strong winds. It borders the eye of a hurricane.
eye of a hurricane
point of lowest pressure within the hurricane with clear weather and calm winds.
lines joining places on the map that have the same air pressure