If you track low pressure areas and fronts you will often notice a particular cycle these systems undergo. The Norwegian cyclone model, so named to honor the Norwegian meteorologists who first conceptualized the typical life cycle of cyclones in the 1910s and 1920s.
In this model, there will initially be a boundary, or front, separating warm air to the south from cold air to the north. The front is often stationary.
A wave develops on the front as an upper level low pressure system, embedded in the jet stream moves, over the front. The front develops a "kink" where the wave is developing. The stationary front changes into a cold front and warm front as the air masses begin to move. Precipitation will begin to develop with the heaviest occurrence along the front (dark green).
As the wave intensifies, both cold and warm fronts become better organized.
The wave becomes a mature low pressure system, while the cold front, moving faster than the warm front, "catches up" with the warm front. As the cold front overtakes the warm front, an occluded front forms.
As the cold front continues advancing on the warm front, the occlusion increases and eventually cuts off the supply of warm moist air, causing the low pressure system to gradually dissipate.