Fronts

A cold front occurs when a cold air mass advances and replaces a warm air mass. Advancing cold fronts force warm moist air to rise sharply, producing showers and thunderstorms during the warm season, and snow during the cold season. As a cold front passes, temperature and humidity drops and air pressure rises.

A warm front occurs when a cold air mass retreats and is replaced by a warmer, generally more humid air mass. As a warm front passes, temperature and humidity rise. The passage of a warm front often implies that a cyclone is approaching and pressures may fall.

A stationary front occurs when a cold air mass and warm air mass meet, but neither moves much in any direction. Cloudiness and light to moderate precipitation may persist for days on the cold side of a stationary front as the warm air gradually rises over the cold air.

An occluded front occurs as a cold front overtakes a warm front, and forces the warm air to rise. The cool air mass remains at the surface. Low clouds and light precipitation usually accompany the passing of an occluded front.

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Winds will always veer after a front passage.