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  1. A trough is an elongated area of lower air pressure. Since pressure is closely linked to wind, there are often changes in wind direction across a trough. If a trough forms in the mid-latitudes, a temperature difference at some distance between the two sides of the trough usually exists and the trough might become a weather front at some

  2. Troughs are regions of relatively low pressure which often precede a cold front. A dashed line on. Figure 2. Cold front, prefrontal trough and high pressure ridge. the weather map indicates the location of a weak pressure trough.

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    • Trough
    • Introduction
    • Development of A Depression

    Whereas fronts separate air masses, which are different in temperature, troughs generally develop in cold air and are characterised by an increase in the frequency and intensity of showers. Pressure begins to fall as the trough approaches and often rises sharply once it has passed. As with fronts, the wind tends to back ahead of the trough and to v...

    A depression is an area of low pressure and is associated with unsettled weather. This is due to the fact that the air within the depression is rising, causing it to cool and the water vapour within it to condense into clouds. This rising air within a depression causes an area of low pressure at the surface. The deeper the depression (or low), the ...

    Stage 1 – Origin and infancy

    The depression usually starts life as a wave, shown on a chart by ‘buckling’ on a front. At this stage, the air is warm to the south of the front and relatively cold to the north of it. The weather in the warm air can vary from fine and sunny to cloudy, sometimes with drizzle and perhaps even with fog. The type of cloud is layered or stratiform and is not very thick. In the cold air, there is usually some cloud, but it tends to be more broken, appearing as discrete speckles on a satellite ima...

  3. Fronts and troughs are different things, but they're intimately connected. Since surface-based frontal boundaries force air to rise, they create elongated swaths of relatively low pressures, characterized on a SLP map by saggy or kinked isobars. Fronts are therefore accompanied by pressure troughs, but usually rather shallow and weak ones.

  4. Oct 24, 2023 · Weather Troughs: Elongated regions of low atmospheric pressure that lead to rising air, cloud formation, and potential precipitation. Trough Types: Positively tilted troughs are less likely to cause severe weather, while negatively tilted troughs are more associated with severe weather events.

  5. Sep 8, 2023 · A stationary front is one that is not moving (i.e. the two air masses on either side are not moving perpendicular to the front – one is not displacing the other). This is depicted by an alternating red and blue line with triangles on the blue portion pointing away from the cool air mass and half-moons on the opposite side of the red portion of the line, pointing away from the warm front.

  6. Oct 14, 2022 · Troughs may be at the surface, or aloft. 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.

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