A cold front is represented by a blue line with triangles oriented in the direction of the front movement. A cold front represents the leading edge of a cold air mass that pushes it way under a warmer, lighter air mass, forcing it to rise rapidly, as a bulldozer effect. This rising motion often creates towering clouds, showers, or thunderstorms, especially if the warm air is moist. As the front passes, there's typically a sudden drop in temperature, a sharp wind shift (often veering), and a quick rise in air pressure. Cold fronts usually move fast and bring abrupt, sometimes violent weather changes, making them especially important for sailors to anticipate. Wind can shift from SE (Jugo) to W or NW in Bora situations.
Example of a cold front moving over englend and Britany on 14 July 2025Passage of a cold front
Cold fronts are fast-moving, sharp-edged boundaries between warm and cold air resulting in quick and dramatic weather changes.
- Temperature: warm of mild air ahead of the front, sudden drop at the passage of the front, followed by cooler air temperature after the front.
- Wind: southerly or south-westerly wind, increasing steadily ahead of the front, veering winds (moving clockwise towards southwest or west) with strong gusts or squall line at the passage of the front, 8-12 m/s (15-25 knots) westerly to north-westerly winds after the passage of the front
- Pressure: falling steadily ahead of the cold front, lowest pressure at the passage of the front, followed by a sharp increase after the front.
- Meteors: thicker cumulus to cumulonimbus ahead of the front, short intense rain with possible thunder at the passage of the front, followed by rapid clearing sky with some lingering cumulus clouds.
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