So far, we have been looking in ~ low pressure systems; cyclones. Yet what around high pressure systems; anticyclones? indigenous a weather view anticyclones can be quite boring.

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Where the air push is high in ~ the surface ar in an anticyclone, the air over it descends. As the air descends, the press rises (because there is more atmosphere above) and so the temperature that the descending air rises. In this case, evaporation typically exceeds condensation and also so cloud droplets nothing form. The air is mostly clear v only tiny amounts the cloud cover.
In the northern Hemisphere winds punch in a clockwise direction roughly an anticyclone. As isobars are typically widely spaced roughly an anticyclone, winds are frequently quite light.
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Anticyclones have the right to be determined on weather charts together an often big area of extensively spaced isobars, where push is higher than surrounding locations (Figure 1). It’s worth noting the there no a an essential pressure value that determines once we have actually high pressure, it merely depends on what is walk on around. If the push is higher in one place than the places about it, then it is a high press area.
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On a satellite image (Figure 2), an anticyclone shows up as a clear area. Anticyclones can carry us very cold, fresh bright winter days and also warm, sunny summer weather.
In winter, the clear, settled conditions and also light winds linked with anticyclones deserve to lead to frost and also fog. The clear skies enable heat come be lost from the surface of the planet to room by radiation, especially overnight, allowing ground temperature to loss steadily, bring about air or floor frosts.
Sometimes in late winter or spring, the air near the soil cools so much that short cloud, or fog, deserve to form. Due to the fact that of the light winds linked with anticyclones; this deserve to linger well right into the adhering to morning and be sluggish to clear. It is recognized as ‘anticyclonic gloom’. In march 2016 to be a usual example of this. When the air near the floor is cooled prefer this, it deserve to lead to there being cooler air near the ground and warmer air above. This reversal that the usual autumn of temperature through height above the soil is dubbed a ‘temperature inversion’ and also it acts together a kind of atmospheric lid, trapping pollution, cloud, and also mist in the cool class of air near the ground.
This describes the an especially depressing nature the anticyclonic gloom: the overcast sky is add by haze and also mist, rising pollution levels, bad or indifferent visibility, and also a moist, heavy atmosphere. Over there may also be a damping that drizzle in the air, yet heavy rain is really unlikely. Such weather may last numerous days, till the high pressure system collapses, or till a weak front introduces cleaner waiting from outside the anticyclone’s circulation.
In summer, the clear cleared up conditions associated with anticyclones permit the Sun’s irradiate to warmth the ground. This can carry long clear days and warm temperatures. The weather is usually dry, return occasionally, really hot temperature can trigger localised thunderstorms.
An anticyclone situated over the UK or close to continent normally brings warm, well weather. In summer over land, days are warm or hot and also sunny, nights are clear.
When anticyclones room over the sea, the weather have the right to vary from fine and sunny come overcast cloud. This cloud might be thick sufficient to give drizzle and may form low sufficient to create fog. This happens many often throughout spring and also is least constant in autumn. If the anticyclone extends end both land and also sea, cloud and fog deserve to spread across seaside regions, sometimes reaching quite far inland.
Sometimes, one anticyclone no move and remains stationary end the UK or surrounding for a longer period of time. This ‘Blocking Highs’ draw away the lot smaller depressions away and lead come a longer period of clear weather, as have the right to be viewed in figure 3.
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Figure 3: A schematic diagram showing how the wind fields approximately a huge anticyclone and tiny depression interact
During the summer, this blocking anticyclones can lead to dryness conditions, as rain-bearing fronts space ‘diverted’ around the country. This is what taken place in 1976 once an anticyclone satellite over the UK for lot of the summer, bring about a remarkable drop in rainfall, well listed below the typical average, and leading to water shortages.
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The summer of 2013 was conquered by anticyclones (Figure 4), top to lengthy nice weather in England and Wales. In the satellite image in number 5 you have the right to see a line of cloud come the phibìc of Ireland. This clues the warm front linked with the Low close to Iceland i beg your pardon you deserve to see in the weather chart. This low will travel to the phibìc of the UK, happen rain to Norway.
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Spring 2013 was likewise characterised by high press – the weather graph (Figure 6) shows a typical situation with high press over every one of the UK. The high press blocked milder, Atlantic wait from getting to the UK and bringing bile cold, north-easterly/ easterly wind. Remember the winds blow roughly anticyclones in a clockwise direction follow me the isobars, and see what that way the wind direction is.
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Occasionally, the High relocated to enable depressions to move up the west coastline of the UK – where the rain ~ above the fronts met the very cold air come the east, it result in hefty snowfall. The typically clear night-time skies in ~ a time of year when the sun wasn’t warm enough throughout the work to heat the floor much, caused the second coldest March because 1910. The winter snow persisted far longer 보다 usual, top to troubles for hill farmer with lamb lambing right into the snow (Figure 7). In parts of Wales laws were relaxed concerning the burial of dead livestock.
Let’s summarise. Anticyclones:are bigger than low pressure systemslast longer than low press systemshave lighter winds blowing around themhave clockwise winds blowing roughly them in the northern Hemisphereusually provide us clean skiescan give us ‘Anticyclonic gloom’ in spring

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