如果暖区中的空气相对锋区是上升的，那么，锋通常是十分活跃的，被称为上滑锋。
If the air in the warm sector is rising relative to the frontal zone the fronts are usually very active and are termed ana-fronts.
随着暖空气上升的上滑暖锋有多层云系，这些云系稳定的增厚， 并向锋的地面位置下降。
The ana-warm front, with rising warm air, has multi-layered cloud which steadily thickens and lowers towards the surface position of the front.
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