Great! I know this, just learned it from science a few days ago, Its a cold front because a cold front happens when cold air pushes the warm air up into the atmosphere and while the warm air cools down it rises and water vapor condenses and the clouds form and rain (or precipitation) falls and it usually it rises and creates severe storms.
Because a warm front, it creates just normal rain for several days and a cold front only happens shortly.
So, my answer would be a
COLD FRONT