Question by: Ing. Giacinta Serra | Last updated: September 20, 2021
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A typical example of the northern hemisphere is given by the Azores anticyclone, which is of great importance in the European meteorological evolution. … In the intermediate seasons, however, the Azores anticyclone moves continuously, resulting in highly variable weather.
What happens in an anticyclonic area?
In the anticyclonic area the pressure increases from the outside towards the inside and the air moves away from the center moving clockwise towards the periphery, replaced by colder, drier and heavier air which tends to descend.
What are the high pressure areas?
High pressure areas are called anticyclonic areas. In them, the opposite situation occurs: the highest pressures are found in the center of the area and the winds in the northern hemisphere blow clockwise away from the center itself.
What is the African heat called?
To cause this new heat wave, the fourth of the summer, is the African anticyclone, called Lucifer. A very hot air mass is expanding over the central Mediterranean. The maximum temperatures will be, especially for the South, with values above 40 degrees with a point of even 45 in some areas.
What determines the Azores anticyclone?
In meteorology, the Azores anticyclone is an area of semi-permanent high pressure of subtropical oceanic origin, generally always present on the North Atlantic Ocean with its maximum atmospheric pressure on average near the homonymous islands; its origin derives from the circulation …
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When will the heat wave end?
Only after the weekend of August the temperatures will become more acceptable and the great heat with record values will end. The peak heat is expected between 12 and 15 August 2021. After this date the heat will gradually subside from north to south.
When does the Azores Anticyclone 2021 arrive?
Today, Tuesday 15 June 2021, the real protagonist will be the infamous Anticyclone of the Azores who will “work”, at least in part, with the African anticyclone.
Why do we say African heat?
The African air mass, for example, once it passes over the Tyrrhenian Sea, tends to humidify, thus generating a feeling of sultry heat. … So here the perceived value will be remarkably close to + 40 ° C, therefore it will be extremely sultry.
What does high atmospheric pressure mean?
Atmospheric pressure – It is the weight that the air exerts on a column with a surface of 1 square meter. Hot air – It is lighter than cold air. … The opposite is high pressure, that is an area characterized by the descent of air from top to bottom.
When does the 2021 heat wave end?
How long will it last? Only between Sunday 1 and Monday 2 August this hot phase could fade, thanks to a new thunderstorm that will likely cause the thermometers to drop, at least in the North and on part of the Center, giving some respite.
Where the air is colder, is the atmospheric pressure higher or lower?
The pressure decreases as the temperature increases because, as it heats up, the air expands, becomes less dense and therefore lighter. For this reason, the masses of hot air have a lower pressure than those of cold air, therefore the former tend to rise, the latter to fall downwards.
When is there high pressure?
In general, experts agree in defining hypertension as the situation in which the values of the systolic pressure (the “maximum”) are higher than 140 mm Hg and those of the diastolic pressure (the “minimum”) are higher than 90 mm Hg.
What are the areas in which low pressure originates?
The low pressure areas on Europe have their epicenter on Poland and the Aegean. The black arrows indicate cold air coming from the north, which produces vast precipitations including snow.
What do we mean by cyclonic and anticyclonic zone?
In meteorology, anticyclones are atmospheric zones of high pressure on the earth’s surface in a circular or elliptical shape, which cause modest variations in the meteorological parameters as opposed to cyclonic zones or zones of low pressure: inside them the winds are weak, often in a breeze regime …
What is the difference between cyclonic areas and anticyclonic areas?
Cyclones are caused by low pressure and rotate counterclockwise in the northern hemisphere and clockwise in the southern hemisphere. The anticyclones are of high pressure and rotate clockwise in the northern hemisphere and counterclockwise in the southern hemisphere.
What is fourth grade atmospheric pressure?
THE ATMOSPHERIC PRESSURE
The air that surrounds us has a weight. The weight of the air exerts a pressure on the earth’s surface: this pressure is called atmospheric pressure. … With high pressure, however, the sky is clear. Atmospheric pressure is measured with an instrument called a barometer.
Why high and low pressure?
The difference between high and low pressure is due to the weight of the air that is above a given piece of land of one square meter.
What is the atmospheric pressure?
Atmospheric pressure (also called barometric) is the force exerted on the surface unit on the ground, or even at altitude, due to the weight of the air above. Normal atmospheric pressure is defined as that which is equivalent to the weight force of a 760 mm high mercury column.
Why African anticyclone?
Unlike the Azores Anti-cyclone
The summer heat waves on our peninsula are almost always due to the presence of high pressure that stretches from North Africa towards the Western Mediterranean, the North African anticyclone.
What is the summer heat called?
The strongest heat wave of summer 2021 is coming: it’s called Lucifer, and it’s an African subtropical anticyclone. Temperatures in the South may reach 47-48 degrees, but peaks of 38-39 ° C are expected in the Po Valley over the weekend.
When do we talk about heat?
From a technical point of view, one should speak of heat only when conditions of high temperature and relative humidity over 70/80 percent occur at the same time. … Usually the heat occurs in summer and is often accentuated in certain heat waves.
Where is the Azores anticyclone located today?
The high pressure of the Azores is one of these and occupies the Atlantic subtropical areas, with peaks often in correspondence with the Azores islands, west of Portugal, from which the name derives.
Why is there no longer the Azores anticyclone?
In phases of more positive temperatures on average, the high pressure of the Azores is more difficult to survive with good continuity, because the atmospheric circulation, also deriving from the thermal state of the ocean surface, is more dynamic.
How is Italy’s climate affected by the Azores anticyclone?
In Italy, when the Azores anticyclone comes to influence the climate, what happens is that the air masses subject to compression are of Atlantic origin, therefore cooler, and it follows that the effects of subsidence overheating on temperatures at soil become much milder.
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