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Meteorology
3.8.1 Warm fronts and cold fronts
The interface can take two main forms:
- warm front
- cold front
3.8.1.1 Warm Front
In warm fronts, the warm air
pushes against the cold, but
because the cold air is heavier,
the warm air will slide up over the
cold air.
A sloping boundary is formed.
This causes the air to be lifted, which condenses to form precipitation or fog.
Typically, a warm front moves at 10 knots, and a cold front moves at 15 knots.
3.8.1.2 Cold Front
In cold fronts, cold air forces its
way under the warm air.
In some cases, the warm air is
lifted to the condensation level,
making it unstable, and it
continues upward on its own, forming showers or possibly thunderstorms.
See an animation of the development of warm and cold fronts here.
3.8.2 Front symbols
Before we proceed, you should know a little about the symbols we use in
connection with fronts; you’ve already encountered symbols in some of the
previous images.
Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 305
