These fronts usually move slowly and bring steady rain or snow over many days.
Warmer, less dense air rising above the Earth’s surface
The air on the front side of the boundary line is cooler than the air on the back side of the boundary line.
Moves in the direction of blue triangles
Usually brings dry conditions and sunny, fair skies.
A warm air mass caught between two cold air masses
Winds flowing in a clockwise direction
These fronts are usually fast moving and bring stormy weather and heavy precipitation
Moves in the direction of red semi-circles
Cooler, dense air sinking to the surface of the Earth
Usually brings cloudy, stormy weather
Warm air is moving toward cold air. The warm, less dense air slides over the cold, more dense air.
Cold, dense air is moving toward warm, less dense air. The warm air is pushed up to cool and form clouds as the cooler air replaces it.
warm and cold air masses touching but not moving
Winds moving in a counterclockwise direction
The air on the front side of the boundary line is warmer than the air on the back side of the boundary line.
Signified with a blue H on a weather map
Signified by a red L on a weather map
These fronts tend to stay in an area for a long period of time, often bringing long periods of precipitation and clouds.
These fronts cause strong winds and precipitation
