Meteorology · Fronts
An occluded front forms when:
- ATwo warm fronts merge over the ocean
- BA high-pressure ridge stalls over warm water
- CThe trade winds reverse direction seasonally
- DA faster-moving cold front overtakes a warm front, lifting the warm air off the surface✓ Correct
Explanation
In a mature low, the cold front catches up to the warm front and the warm air is forced aloft, producing an occlusion. Occluded fronts bring a mix of warm- and cold-front weather and usually mark a weakening, aging system.
Authority: Bowditch (Pub. No. 9)
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