Weather front

Weather front is a boundary separating two masses of air of different densities, and is the principal cause of meteorological phenomena outside the tropics. In surface weather analyses, fronts are depicted using various colored lines and symbols, depending on the type of front. The air masses separated by a front usually differ in temperature and humidity.

Weather fronts are the leading edge of a temperature gradient within a single air mass and mark the boundary between two air masses of different densities. When a front passes through an area, it is marked by changes in temperature, humidity, wind, and often precipitation. There are four primary types of weather fronts: cold fronts, warm fronts, stationary fronts, and occluded fronts.

Types of Weather Fronts

Cold Front

A cold front occurs when a cold air mass moves into a warmer air mass. Cold fronts are usually associated with heavy thunderstorms, large changes in temperature, and sharp changes in wind direction. The symbol for a cold front on a weather map is a blue line with triangles pointing in the direction of movement.

Warm Front

A warm front occurs when a warm air mass moves over a cold air mass. Warm fronts are typically associated with gradual increases in temperature, cloudiness, and prolonged periods of light to moderate precipitation. The symbol for a warm front on a weather map is a red line with semicircles pointing in the direction of movement.

Stationary Front

A stationary front occurs when two air masses are not strong enough to replace each other, leading to a standstill. Stationary fronts can lead to days of cloudy, wet weather. The symbol for a stationary front on a weather map is a combination of blue triangles and red semicircles on opposite sides of one line.

Occluded Front

An occluded front occurs when a cold front overtakes a warm front. This type of front is associated with complex weather patterns, including various types of precipitation. The symbol for an occluded front on a weather map is a purple line with alternating triangles and semicircles.

Effects of Weather Fronts

Weather fronts can cause a variety of weather conditions, ranging from clear skies and mild weather to severe storms and changes in temperature. The type of weather experienced depends on the type of front and its intensity. For example, cold fronts often lead to short-lived but intense storms, while warm fronts are associated with prolonged periods of precipitation.

Forecasting

Meteorologists use satellite imagery, radar data, and surface weather observations to track and predict the movement of weather fronts. Forecasting the timing and impact of these fronts allows for advanced warnings of severe weather, helping to minimize its effects on people and property.

See Also

• Air mass
• Meteorology
• Weather map
• Weather prediction

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  Unusually well-defined warm front

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  Origin of air masses

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  NWS weather fronts

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  Occluded cyclone

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  Dangerous shelf cloud

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  Konvektionsregen