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The precipitation generally occurs before the front moves in.
Not normally before a warm front, precipitation comes before and after a cold front. When you have warm air and a cold front comes through, you mix warm with cold and that brings precipitation.
It is true to say precipitation usually comes ahead of a warm front.
altostratus
A cold front brings in cold air. The cold air causes warm air to rise quickly. The rising air forms cumulus clouds. There is often heavy precipitation at a cold front.
stationary front
The precipitation generally occurs before the front moves in.
The intensity of precipitation is greater but the duration is shorter along a cold front. As a cold front moves through an area, it pushes warm air upward, leading to strong vertical uplift and intense precipitation. However, the cold front typically moves quickly, causing the precipitation to be relatively brief compared to other types of fronts.
A warm front generally has a gradual slope. It produces heavy precipitation not only over a large area, but small areas as well.
The type of front which will lead to turbulent air and precipitation is a cold front. When warm cold air collides with warm air, it will generally produce severe weather.
The weather associated with a stationary front is similar to that produced by a warm front. And a warm front generally brings drizzly precipitation. :)
Not normally before a warm front, precipitation comes before and after a cold front. When you have warm air and a cold front comes through, you mix warm with cold and that brings precipitation.
Precipitation usually comes before or during the passage of a cold front.
cold front
It is true to say precipitation usually comes ahead of a warm front.
It arrives in front of the warm front
Warm front--rise in temperature; gentle rain; longer duration Cold front--drop in temperature; violent precipitation including storms; shorter duration Stationary front--many days of precipitation along the frontal boundary Occluded front--precipitation