Another has properly said - A Stationary Front. Adding that, when movement recommences the cold Air Mass will invariably subside below and then underneath the warm Air Mass.
A good and easy lesson on the causes of Rainfall is that wherever Air rises Clouds form - Air rises, it expands, it cools and can no longer hold as much Water Vapor - and it Rains.
kkk
The atmosphere moves in masses. When two masses collide they are called fronts. When a cold air mass goes into the land occupied by a warm mass it makes a cold front. The opposite makes a warm mass.
A cold front develops when a cold air mass advances, lifting the air in a warm air mass.
cold fronts are heavier than warm fronts
The boundary between two air masses is called a front. A warm front develops when a warm air mass pushes against a cold air mass. Rain usually occurs in a warm front and if temperature is low enough, snow falls.
kkk
as they collide the cold and warm front pushes the occluded front to become 3 air masses.
When two air masses collide, it is called a front.
The atmosphere moves in masses. When two masses collide they are called fronts. When a cold air mass goes into the land occupied by a warm mass it makes a cold front. The opposite makes a warm mass.
A tonado develops once two different air masses where to meet such as a cold front and a warm front
fog
Thunderstorms form when 2 air masses collide the most common is a cold dry airmass and warm humid moist airmass. Those air masses collide and if the conditions are right the moisture will rise into the atmosphere and condense into clouds and eventually will build up enough to become thunderstorms.
The point where these two air masses meet is called a front.If cold air advances and pushes away the warm air, it forms a cold front.When warm air advances, it rides up over the denser, cold air mass to form a warm front.If neither air mass advances, it forms a stationary front.
A cold front develops when a cold air mass advances, lifting the air in a warm air mass.
A front is part of a middle latitude low but it is not part of a tropical hurricane. Fronts happen when cold and warm air masses collide or occlude.
A cold front.
Warm air masses are lighter than cold air masses because the molecules of cold air move slower than the warm air's molecules.