Fronts
This is a boundary between two air masses
What is a front?
These air masses originate over water
What are maritime air masses?
This is caused by the weight of the air above an area
What is air pressure?
This measures temperature in Fahrenheit and Celsius
What is a thermometer?
The H representing high pressure on a weather map is to show air that is cooling so it is this color
What is blue?
These are warm air masses that replace cold air masses
What are warm fronts?
You can tell air masses apart by temperature and this
What is humidity?
Air pressure does this with increasing height above Earth
What is decreases?
This helps determine direction when reading weather maps.
What is a Compass Rose?
Rainy and cloudy weather is as with this pressure system
What are low pressure systems?
These fronts cause pressure to increase
What are cold fronts?
These air masses are less dense
What are cold air masses?
This makes sunny clear skies with calm winds that spiral clockwise
What are high pressure systems?
Air pressure is measured with this
What is the barometer?
Topographic maps use contour lines to show this
What is elevation?
Showers and thunderstorms form around the leading edges of these fronts
What are cold fronts?
This is a large body of air with relatively similar temperature and humidity
What are air masses?
This creates greater pressure on the barometer
What is high pressure?
This measures wind speed in mph
What is the anemometer?
One millibars is equal to .02953 of this
What is Mercury?
These cause light rain over several days
What are stationary fronts?
These air masses are cold and approach from N,NW, or W
What are polar air masses?
These are lines connecting points of equal atmospheric pressure
What are isobars?
This carries instruments to high altitudes
What is a weather balloon?
As air pressure increases this decreases
What is density?