Definition: An allusion is a figure of speech whereby the author refers to a subject matter such as a place, event, or literary work by way of a passing reference.It is up to the reader to make a connection to the subject being mentioned.llusion def. Definition: A brief and indirect reference to a person place, thing, or idea of historical, cultural, literary or political significance. It does not describe in detail the person or thing to which it refers.
A warm air occlusion or occluded front is less common than a cold occlusion. A warm occlusion occurs as cool air moves rapidly into an area with an existing warm front. The difference from a cold occlusion is that the approaching cool air is not as cold as the retreating cold air in the existing front. In other words, the fast-moving, incoming air is cold, but not as cold as the air mass ahead of it. Precipitation can usually be expected when an occluded front passes through an area. Sometimes a cold front will catch up to a warm front and overtake both it and the cooler air out ahead of it. If this happens, an occluded front is born.
As the depression intensifies, the cold front catches the warm front. The line where the two fronts meet is called an occluded front. When an occluded front passed overhead, you feel changes in temperature and wind speed. A cold occlusion occurs when the air behind the occluded front is colder than the air ahead of it. The cold occlusion acts in a similar way to a cold front in that the the cold air behind the front undercuts the cool air ahead of it. The other type of occluded front is the warm occlusion. A warm occlusion occurs when the air behind the occluded front is warmer than the air ahead of it. The warm occlusion acts in a similar way to a warm front in that the cool air behind the front is lighter than the cold air ahead of the front. This causes the cool air to pass over the top of the cold air.