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1. about.metservice.com › our-company › learning-centreHow to Read Weather Maps » About MetService

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   When isobars make a sharp bend around a Low, this bend area is calleda trough of low pressure or simply a trough. Troughs are also often shaped like tongues and usually contain weather similar to lows and fronts. Horizontal convergence is the coming together of two flows of air.

   • Climate Summary

     Station Height Rainfall mm mean annual Wet days >1.0mm...

2. www.rmets.org › metmatters › how-interpret-weather-chartHow to interpret a weather chart | Royal Meteorological Society

   www.rmets.org › metmatters › how-interpret-weather-chart

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   • Where Are You?
   • Which Way The Wind Blows
   • Frontal Battleground

   The first thing you need to find on a pressure chart is the land – usually, the UK is located fairly centrally, with Iceland and Greenland to the top left and continental Europe to the right. The projection might seem a little bit odd, but having north, where the lines of longitude converge, in the top left corner means we can see as much as possib...

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   The easiest thing to spot is how strong the wind will be. The closer together the black lines or isobars are, then the windier it is. There is a slight caveat here in that the speed varies with latitude, but on the scale of the UK, it doesn’t matter too much. Wind blows almost parallel to the isobars, and in order to tell which way the wind is blow...

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   The boundary between two air masses is where the interesting weather happens. The concept of weather fronts first appeared in 1919 when Norwegian meteorologist Wilhelm Bjerknes identified that this transition zone was like a battleground between two opposing air masses and termed it a front. In our latitudes a front usually separates warm, moist tr...

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3. Videos

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     3:55

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     Trough (meteorology)

     3 Dec 2015

     4.7K views

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     2:27

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     Identifying Troughs and Ridges

     12 Feb 2014

     58.8K views

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     1:16:06

     youtube.com

     Trough Talk #93 The Divide with Turner Meeker, Kevin Cali, and Todd Meeker

     9 Aug 2024

     4.1K views

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4. media.bom.gov.au › social › blogThe art of the chart: how to read a weather map - Social ...

   media.bom.gov.au › social › blog

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   A trough appears on the weather map as a dashed blue line on the chart. It is an elongated area where atmospheric pressure is low relative to its immediate surroundings. Like cold fronts, troughs separate two different air masses (usually more moist air on one side and drier air on the other).

5. www.metoffice.gov.uk › weather › learn-aboutHow to read synoptic weather charts - Met Office

   www.metoffice.gov.uk › weather › learn-about

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   Troughs. 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...

6. www.noaa.gov › jetstream › wxmapsHow to read Surface Weather Maps | National Oceanic and ...

   www.noaa.gov › jetstream › wxmaps

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   Sep 8, 2023 · A trough is not a boundary but an elongated area of lower air pressure. There are changes in wind direction across a trough, but there is no change in air mass. While not specifically a surface boundary, troughs reflect the change in atmospheric conditions in the upper atmosphere.

7. www.livescience.com › 39004-weather-frontsWeather Fronts: Definition & Facts | Live Science

   www.livescience.com › 39004-weather-fronts

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   Aug 20, 2013 · Unlike fronts, there is no universal symbol for a trough on a weather chart. In the United States, for instance, a trough is delineated by a black dashed line.

8. People also ask

   What is a trough on a weather map?

   • A trough appears on the weather map as a dashed blue line on the chart. It is an elongated area where atmospheric pressure is low relative to its immediate surroundings. Like cold fronts, troughs separate two different air masses (usually more moist air on one side and drier air on the other).

   The art of the chart: how to read a weather map

   media.bom.gov.au/social/blog/2391/the-art-of-the-chart-how-to-read-a-weather-map/

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   Why is a trough a weather front?

   • 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 point.

   Trough (meteorology) - Wikipedia

   en.wikipedia.org/wiki/Trough_(meteorology)

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   What are troughs and ridges?

   • Since low pressure implies a low height on a pressure surface, troughs and ridges refer to features in an identical sense as those on a topographic map. 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.

   Trough (meteorology) - Wikipedia

   en.wikipedia.org/wiki/Trough_(meteorology)

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   What do black lines mean in a trough?

   • 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.

   How to read synoptic weather charts - Met Office

   www.metoffice.gov.uk/weather/learn-about/weather/how-weather-works/synoptic-weather-chart

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   How does a trough affect weather?

   • Their motion induces upper-level wind divergence, lifting and cooling the air ahead (downstream) of the trough and helping to produce cloudy and rain conditions there. Unlike fronts, there is not a universal symbol for a trough on a surface weather analysis chart. The weather charts in some countries or regions mark troughs by a line.

   Trough (meteorology) - Wikipedia

   en.wikipedia.org/wiki/Trough_(meteorology)

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   How does a trough affect a cold front?

   • Like cold fronts, troughs separate two different air masses (usually more moist air on one side and drier air on the other). As the trough moves towards the moist air it lifts it. This causes cloud or even showers and thunderstorms to develop. If the trough moves back in the other direction it will drag the moist air with it.

   The art of the chart: how to read a weather map

   media.bom.gov.au/social/blog/2391/the-art-of-the-chart-how-to-read-a-weather-map/

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9. en.wikipedia.org › wiki › Trough_(meteorology)Trough (meteorology) - Wikipedia

   en.wikipedia.org › wiki › Trough_(meteorology)

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   Unlike fronts, there is not a universal symbol for a trough on a surface weather analysis chart. The weather charts in some countries or regions mark troughs by a line. In the United States, a trough may be marked as a dashed line or bold line.