There are two types of occlusion, warm and cold. In a cold occlusion, the air mass overtaking the warm front is cooler than the cool air ahead of the warm front, and plows under both air masses. In a warm occlusion, the air mass overtaking the warm front is not as cool as the cold air ahead of the warm front, and rides over the colder air mass while lifting the warm air.
Today a cold front is overtaking a warm front - warm air is separated (occluded). Therefore, there will be very little temperature change as the front passes today. Cold air will fill in behind the front tomorrow.
Pink front is the occlusion. Cold front drives south.
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