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SESK: Stuff Everyone Should Know · sesk.info/aero-warm-front-overrides-cold

What happens as a warm front advances?

Warm air glides over colder air because it is less dense.

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  1. Warm air rises over cold air ✔
  2. Cold air vanishes instantly
  3. Both air masses stop moving

Why: At a warm front, advancing warm air meets denser cold air. The lighter warm air is lifted gradually over the cold air.

Huh, didn't know that: Fronts come in four kinds: warm, cold, stationary, and occluded.

The dad joke
The warm front took the upper route to avoid traffic.
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References

Answer: Warm air rises over cold air. At a warm front, advancing warm air meets denser cold air. The lighter warm air is lifted gradually over the cold air.

  1. Aerospace Dimensions Module 3, Air Environment akwg.cap.gov/media/cms/Module_3__Air_Environment_D8702BF7F9162_21bba.pdf
    The warm air overrides the cold because it is lighter.
    Checked 2026-10-10.

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