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- In summary, troughs and weather fronts are related elements in the broader context of atmospheric circulation and weather systems. Troughs are areas of low pressure that can interact with weather fronts, particularly cold fronts, to influence weather patterns and the development of various weather conditions.
climavision.com/blog/weather-troughs-formations-impacts-and-types/Weather Troughs: Formations, Impacts, and Types - Climavision
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- Pressure Pattern
- Cold Fronts and Warm Fronts
- Warm and Cold Fronts
- Occluded Fronts
- Troughs
The circular lines you see on the chart are isobars, which join areas of the same barometric pressure. The pressure pattern is important because we can use it to tell us where the wind is coming from and how strong it is. It also shows areas of high and low pressure. Air moves from high to low pressure along a gradient (similar to squash that is le...
Also on a synoptic chart are the lines, triangles and semi-circles representing 'fronts'. With the atmosphere trying to balance temperature, pressure and wind there are different sorts of air, known as air masses, circulating around the Earth. The differences are mostly between how warm, cold, dry and moist the air is, and fronts simply mark the bo...
A warm front is shown with a red line and red semi-circles and a cold front with a blue line and blue triangles. The way in which the semi-circles or triangles point shows the direction in which the front is moving. The position of a front depends on a number of meteorological factors, such as changes in wind direction or temperature, which we get ...
Cold fronts tend to move faster than warm fronts and over time they can catch up with each other and create an 'occluded' front. This is shown as a purple line with a purple semi-circle and triangle next to each other. The air trapped between a warm and cold front is called a 'warm sector' and we often see low cloud and patchy light rain associated...
Black lines that have no semi-circles or triangles are called 'troughs' and mark areas where the air is particularly unstable. This means that the air is quite turbulent or moving around a lot, especially when we have, for example, warm air beneath cold air that wants to rise. We tend to see showers associated with this type of air, therefore they ...
Troughs may be at the surface, or aloft, at altitude. Near-surface troughs sometimes mark a weather front associated with clouds, showers, and a wind direction shift. Upper-level troughs in the jet stream (as shown in diagram) reflect cyclonic filaments of vorticity. Their motion induces upper-level wind divergence, lifting and cooling the air ...
- Cold fronts. Cold fronts are marked on weather maps with the symbol of a blue line of triangles/spikes (pips) pointing in the direction of travel, and are placed at the leading edge of the cooler air mass.
- Warm fronts. Warm fronts are marked on weather maps with a red line of half circles pointing in the direction of travel and mark the edge of an advancing warm air mass; a flow of warmer air that overtakes and replaces colder air.
- Stationary fronts. Stationary fronts are depicted by alternating red half-circles and blue spikes (pips) pointing in opposite directions, indicating no significant movement.
- Occluded fronts. Cold fronts almost always travel faster than warm fronts and eventually they catch up to it. When this happens the warm air is forced up away from the ground, and their associated low pressure system is said to be occluded.
Weather fronts mark the boundary between two different air masses, which often have contrasting properties. For example, one air mass may be cold and dry and the other air mass may be...
Other features on a weather chart are fronts and troughs. These are drawn to highlight the areas of most significant weather, but that does not mean that there is nothing of significance elsewhere on the chart.
A trough (of low pressure) is a pressure feature of the synoptic chart; it is characterised by a system of isobars which are concave towards a depression and have maximum curvature along the axis...
