Cold fronts move slowly across the landscape.
A squall line is a line of severe thunderstorms that forms along a cold front .
A warm front is found where warm air mass slides over a cold air mass
At stationary fronts the air masses move rapidly.
The temperature gradient or temperature difference across the front may decrease, so the air masses start to mix.
When a cold air mass takes the spot of a warm air mass, there is a warm front.
An occluded front or occlusion usually forms around a high pressure system.
The meeting place of two air masses with different characteristics is called a warm front.
A change in temperature over distance is called a temperature gradient.
As the warm air mass approaches, temperatures rise.
