This is typically a cold front. As the cold air mass moves under the warm air mass, it pushes the warm air upwards, where it condensates and creates precipitation.
considerably ahead of the actual frontal boundary
It is true to say precipitation usually comes ahead of a warm front.
warm fron
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A Glacier will advance when the snow deposited in the collection zone exceeds the rate of melting at the terminus. There will be some time delay between these events, even a steep glacier will take a few years between the events.
Thermal Supercooling occurs when an advancing planner solid liquid interface becomes unstable andtriggers a spike that will appear on the interface which will then grow into a cellular type structure.While Constitutional Supercooling occurs due to compositional change, and results in cooling a liquid below its freezing point ahead of the solid liquid interface.
A cold front normally moves at twice the speed of a warm front. An occluded front forms when a cold front catches up with a warm front. Occluded fronts are of two types:1. Cold occlusion : If the airmass of the advancing cold front is colder than the cool airmass of the warm front, the advancing cold front undercuts and lifts both the warm and cool airmass of the warm front. The weather is initially warm front type but during the passage of front, showery weather of cold front occurs. This occlusion is common in summer. 2. Warm occlusion : When the airmass behind the advancing cold front is less colder (cool) than the cold airmass of the warm front ahead, the advancing cold front overrides the warm front ahead. The weather in such a case is similar to that of warm front. This type of occlusion occurs in winters and is less common.
A cold front normally moves at twice the speed of a warm front. An occluded front forms when a cold front catches up with a warm front. Occluded fronts are of two types:1. Cold occlusion : If the airmass of the advancing cold front is colder than the cool airmass of the warm front, the advancing cold front undercuts and lifts both the warm and cool airmass of the warm front. The weather is initially warm front type but during the passage of front, showery weather of cold front occurs. This occlusion is common in summer. 2. Warm occlusion : When the airmass behind the advancing cold front is less colder (cool) than the cold airmass of the warm front ahead, the advancing cold front overrides the warm front ahead. The weather in such a case is similar to that of warm front. This type of occlusion occurs in winters and is less common.
An occluded front is when a warm air mass is caught between two cooler air masses.1. Cold occluson : If the airmass of the advancing cold front is colder than the cool airmass of the warm front, the advancing cold front undercuts and lifts both the warm and cool airmass of the warm front. The weather is initially warm front type but during the passage of front, showery weather of cold front occurs. This occlusion is comon in summers. 2. Warm occlusion : When the airmass behind the advancing cold front is less colder (cool) than the cold airmass of the warm front ahead, the advancing cold front overrides the warm front aheaad. The weather in such a case is similar to that of warm front. This type of occlusion occurs in winters and is less common.
Cumuliform clouds typically form along or ahead of a cold front. Most cloudiness and precipitation associated with a cold front occur as a relatively narrow band along or just ahead of where the front intersects Earth's surface.
Along fronts low pressure systems form. Depending on what type of front it is, the air pressure will drastically increase or decrease. Because the front is the edge of an incoming air mass, precipitation occurs often ahead of the front. Fronts of incoming air masses are subject to prevailing winds, and are influenced in direction. Often, clouds form along fronts, which is why when a front has passed in there has been rain, or snow, or any other form of precipitation.
Example: Paris (place A) is ahead of time than London (place B), because sunrise occurs earlier in Paris.