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A boundary between two air masses of different density, moisture, or temperature is called a FRONT.
Cloudiness , precipitation , and storms sometimes occur at frontal boundaries. Four types of fronts include cold, warm, occluded, and
stationary.
This is a Occluded Front
Occluded Fronts A occluded Fronts involves 3 air masses of different
temperature cold air , cool air, and warm air. A Occluded fronts may form when a cold air mass moves toward cool air with warm air between the two. A cold front can even take over a warm fronts
Stationary FrontsS tationary fronts occur when neither warm nor cold air
advances. The two air masses reach a stalemate. That is what stationary means - that neither front is moving. These type of conditions can last for days, producing nothing but A ltocumulus clouds. Temperatures remain stagnant and winds are gentle to nil.