when two masses of air are not strong enough to push the other one out
what is a stationary front
200
fall
what season do hurricanes form in?
200
The amount of water
What does a rain gauge measure?
200
on the compass direction from where it blows
how are winds named?
200
west to east
where do fronts come from in the united states
200
Air pressure is the weight of the atmosphere pressing down on the earth. It is measured by a barometer in units called millibars. Most barometers use mercury in a glass column, like a thermometer, to measure the change in air pressure.
What is air pressure
300
warm front
What conditions need to happen for a thunderstorm to form?
300
wind speed
What does an anemometer measure?
300
west to east
What direction is wind blowing in the United States
300
warm air masses replace cold masses
how is a warm front created?
300
clear skies
are high pressure systems clear skies or cloudy skies?
400
ocean water
What is hurricanes source
400
it determains the direction of the wind
what does a wind vane do?
400
differences in air pressure
how do winds form?
400
it becomes a stationary front
what happens when a front stops
400
cloudy skies
What do low pressure days bring
500
a violent disturbance of the atmosphere with strong winds and usually rain, thunder, lightning, or snow.
What is weather
500
A THERMOMETER measures the air temperature. Most thermometers are closed glass tubes containing liquids such as alcohol or mercury. When air around the tube heats the liquid, the liquid expands and moves up the tube. A scale then shows what the actual temperature is.
What are weather instruments
500
when the pressures stop pushing on eachother
how do winds stop blowing?
500
A weather front is a boundary separating two masses of air of different densities, and is the principal cause of meteorological phenomena
What is a front
500
The highest sea-level pressure on Earth occurs in Siberia, where the Siberian High often attains a sea-level pressure above 1050.0, with record highs close to 1085.0.