🔍 Key Concepts

• structure of a warm front and how it slopes over cold air • typical cloud sequence ahead of an approaching warm front • differences between frontal fog and frontal clouds

💭 Think About

• Think about which cloud types usually appear far in advance of the surface position of a warm front. • Consider which option shows a gradual, layered progression rather than sudden, local effects. • Ask yourself which phenomena are more typical of the front itself passing versus the earliest distant signs that it is on the way.

✅ Before You Answer

• Verify which answer choice describes high-level clouds rather than low clouds or surface phenomena. • Check which option shows a sequence or change over time, not just a single condition. • Confirm from your weather notes that warm fronts are typically first seen as thin, high clouds well ahead of the front.