Friction along the front heats the air and makes clouds.
The cold air of the cold front can't hold as much moisture, so it becomes cloud banks.
The warm air is stable and cooled by radiation escaping to space.
When air moves it becomes opaque.
The warm air rises and cools adiabatically over the cooler air.
Counterclockwise because of its high pressure.
From north to south because they originate at the polar front.
Clockwise because of its low pressure.
Clockwise because of its high pressure.
Counterclockwise because of its low pressure.
Clouds are absent along the warm front.
Precipitation is unlikely.
The warm front is moving faster than the cold front.
Occlusion is occurring.
The warm and cold fronts are fully separated.
Large number of mobile homes.
Rain shadow effect from the Rocky Mountains.
Influence of the Gulf Stream.
The urban heat islands.
Ready interaction of the mT and CP air masses.
A day of slow but steady precipitation ends.
Clouds begin to get lower and thicker.
The winds will flow from the north.
The air mass will always be a cP.
California and Nevada
Mississippi and Alabama
Oklahoma and Kansas
Kentucky and West Virginia
Kentucky and Tennessee
Move from west to east.
Move from east to west.
Move from north to south.
Move from south to north.
Cold air inversion
Tornadoes are measured on the Enhanced Fujita scale.
When the tornado becomes clogged with the air it takes in, the funnel strengthens.
Tornadoes can be on the ground for hundreds of kilometers and last for several hours.
Tornadoes are classified on a scale from 0 to 6.
The average duration of a tornado is about 15 minutes.
An air mass that moves from the northern Pacific Ocean to northern Canada, where it stagnates for a couple of weeks in January, will tend to warm up because the land is still warm relative to the lower atmosphere.
Air masses are named by their temperature and humidity characteristics.
Air masses are named by their height and appearance.
An air mass is any large body of the lower atmosphere that has fairly uniform conditions of temperature and moisture.
An air mass derives its characteristics from a source region.