* Cold Front: This occurs when a cold air mass displaces a warm air mass. The cold air is denser, so it wedges under the warm air, forcing it to rise rapidly. This rapid rising leads to the formation of cumulus clouds, thunderstorms, and sometimes tornadoes.
* Warm Front: This occurs when a warm air mass displaces a cold air mass. The warm air rises over the cold air, forming a gentle slope. This leads to widespread, stratiform clouds and often brings steady rain or snow.
The specific weather that forms depends on the specific characteristics of the air masses and how they interact. However, both types of fronts are associated with significant changes in temperature, wind, and precipitation.