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[Why series] Earth Science Episode 3 – High Air Pressure and Low Air Pressure
[Why series] Earth Science Episode 3 – High Air Pressure and Low Air Pressure
[Why series] Earth Science Episode 3 – High Air Pressure and Low Air Pressure
Low-pressure area [1]
In meteorology, a low-pressure area, low area or low is a region where the atmospheric pressure is lower than that of surrounding locations. Low-pressure areas are commonly associated with inclement weather (such as cloudy, windy, with possible rain or storms),[1] while high-pressure areas are associated with lighter winds and clear skies.[2] Winds circle anti-clockwise around lows in the northern hemisphere, and clockwise in the southern hemisphere, due to opposing Coriolis forces
The formation process of a low-pressure area is known as cyclogenesis. In meteorology, atmospheric divergence aloft occurs in two kinds of places:
– A second is an area where wind divergence aloft occurs ahead of embedded shortwave troughs, which are of smaller wavelength.. Diverging winds aloft, ahead of these troughs, cause atmospheric lift within the troposphere below as air flows upwards away from the surface, which lowers surface pressures as this upward motion partially counteracts the force of gravity packing the air close to the ground.
The Highs and Lows of Air Pressure [2]
Air near the surface flows down and away in a high pressure system (left) and air flows up and together at a low pressure system (right).. Standing on the ground and looking up, you are looking through the atmosphere
We live at the bottom of the atmosphere, and the weight of all the air above us is called air pressure. Above every square inch on the surface of the Earth is 14.7 pounds of air
With fewer air molecules above, there is less pressure from the weight of the air above.. Pressure varies from day to day at the Earth’s surface – the bottom of the atmosphere
Why is the weather different in high and low-pressure areas? [3]
Why is the weather in high-pressure areas usually fair? Why is the weather in low-pressures areas usually cloudy and stormy? Most weather maps show areas, labeled with an H, where the atmospheric pressure is relatively high, and areas labeled with an L where the atmospheric pressure is relatively low. The isobars around such areas are closed curves with the approximate shape of circles
Winds blow outward from these areas, although in a spiraling way. As air leaves the high-pressure area, the remaining air sinks slowly downward to take its place
High-pressure areas usually are areas of fair, settled weather. Low-pressure areas are places where the atmosphere is relatively thin
5 Effects Barometric Pressure Has on Humans That You Really Can Feel [4]
5 Effects Barometric Pressure Has on Humans That You Really Can Feel. When the weather changes, there’s more pressure in the air than just to come up with something clever at the water cooler.
We feel those changes inside of us just as powerfully as the charged air of the world.. We’re talking about barometric pressure – the weight of the environment outside.
– Atmospheric (barometric) pressure goes down when weather conditions become more severe – thunder clouds rolling in, the sky darkening, wind picking up, etc.. – Atmospheric (barometric) pressure goes up when weather conditions level out – clouds clear, humidity drops, etc.
Pressure system [5]
A pressure system is a peak or lull in the sea level pressure distribution. The surface pressure at sea level varies minimally, with the lowest value measured 87 kilopascals (26 inHg) and the highest recorded 108.57 kilopascals (32.06 inHg)
Pressure systems cause weather to be experienced locally. Low-pressure systems are associated with clouds and precipitation that minimize temperature changes throughout the day, whereas high-pressure systems normally associate with dry weather and mostly clear skies with larger diurnal temperature changes due to greater radiation at night and greater sunshine during the day
A low-pressure area is a region where the atmospheric pressure at sea level is below that of surrounding locations. Low-pressure systems form under areas of wind divergence that occur in the upper levels of the troposphere.[1] The formation process of a low-pressure area is known as cyclogenesis.[2] Within the field of atmospheric dynamics, areas of wind divergence aloft occur in two areas:
High and low pressure [6]
High and low pressure systems cause day-to-day changes in our weather. In this article, we look at how they are defined and how they form.
Pressure is measured in hectoPascals (hPa), also called millibars. Standard pressure at sea level is defined as 1013hPa, but we can see large areas of either high or low pressure
On a weather chart, lines joining places with equal sea-level pressures are called isobars. Charts showing isobars are useful because they identify features such as anticyclones (areas of high pressure) and depressions (areas of low pressure).
The Highs and Lows of Air Pressure [7]
Air near the surface flows down and away in a high pressure system (left) and air flows up and together at a low pressure system (right).. Standing on the ground and looking up, you are looking through the atmosphere
We live at the bottom of the atmosphere, and the weight of all the air above us is called air pressure. Above every square inch on the surface of the Earth is 14.7 pounds of air
With fewer air molecules above, there is less pressure from the weight of the air above.. Pressure varies from day to day at the Earth’s surface – the bottom of the atmosphere
High and Low Pressure [8]
If you are a regular viewer of weather broadcasts, chances are you’ve heard the following from your local TV meteorologist: “plenty of sunshine is in store today as high pressure is in control over the area.” Or: “expect rain to spread into the area as a low pressure system approaches.” It is well established that high pressure is generally associated with nice weather, while low pressure is generally associated with cloudy, rainy, or snowy weather. In order to understand the types of weather conditions generally associated with high and low pressure systems, we must think “vertically.” The motion of air in the atmosphere above our heads plays a large part in the weather we experience here at earth’s surface
On the other hand, sinking air is associated with warming and drying conditions. So the first important point to keep in mind is rising air = moistening, sinking air = drying.
But why? The answer has to do with the typical air flow around high and low pressure. Physically, it seems to make sense to have air flow from high pressure to low pressure
High pressure versus low pressure. What does each bring weather-wise? [9]
High pressure and low pressure have two distinct types of weather associated with them…typically. High pressure often means dry weather with sunshine
When air sinks from high in the atmosphere to the lower levels it warms up and dries out. This is because air at the top of the atmosphere is less dense
This acts to warm up the air (moving the molecules faster). The faster moving air molecules mean that the water molecules are unlikely to stick together, due to high momentum
Why is the weather different in high and low-pressure areas? [10]
Why is the weather in high-pressure areas usually fair? Why is the weather in low-pressures areas usually cloudy and stormy? Most weather maps show areas, labeled with an H, where the atmospheric pressure is relatively high, and areas labeled with an L where the atmospheric pressure is relatively low. The isobars around such areas are closed curves with the approximate shape of circles
Winds blow outward from these areas, although in a spiraling way. As air leaves the high-pressure area, the remaining air sinks slowly downward to take its place
High-pressure areas usually are areas of fair, settled weather. Low-pressure areas are places where the atmosphere is relatively thin
What Weather Occurs During a High Pressure System? [11]
You’ve probably often heard television weather reporters talk about high and low pressure systems, and there’s a good reason why the pressure is such an important part of the weather forecast. High and low pressure zones indicate distinctly different types of weather on the way
Cold air is denser and heavier than warm air, so it tends to sink while warm air tends to rise. In areas where winds converge at high altitude, cold air sinks and creates a temporary buildup of air near the Earth’s surface and thus a zone of high pressure
As moisture-laden warm air rises, it begins to cool. Eventually, it reaches the point where the temperature of the air is low enough to become saturated with moisture
Weather Questions: What is pressure and how does it affect the weather? [12]
Weather Questions: What is pressure and how does it affect the weather?. This week’s weather question was submitted by Sandi Day
You hear meteorologists all the time talking about low and high pressure, because it is extremely impactful on weather. Atmospheric pressure refers to the weight of the air.
The air is lighter than the surrounding air masses so it rises, causing an unstable environment. Rising air makes the water vapor in the air condense and form clouds and rain for example.
High Pressure and Low Pressure: What Does it Mean for Weather? [13]
When you read about any weather event, or perhaps even just a mundane daily weather report, you always hear the weather reporter referring to high-pressure and low-pressure areas. What are they and what does it mean for the weather? Keep reading to find out.
You might think air is weightless, but it’s not! Every square inch of planet Earth has around 14.7 pounds of air pressing down on it. This measurement is commonly referred to as pounds per square inch or psi.
Air pressure tends to be higher when temperatures are higher. However, the way this affects our planet is actually the opposite
Why is atmospheric pressure so important to the forecast? [14]
Why is atmospheric pressure so important to the forecast?. Differences in air pressure are a cornerstone of the changing weather conditions on the planet.
But have you ever wondered why we’re always so infatuated with all those blue H’s and red L’s on a weather map?. Differences in air pressure are a cornerstone of the changing weather conditions on the planet
As warm, tropical air rises, it creates lower pressure at the surface (think of it as “missing” some air that just rose off the surface, meaning the pressure has dropped), while cold, sinking air can create areas of high pressure.. As the air rises inside lower pressure, it will cool and condense into clouds and eventually rain and/or snow
Why does high pressure mean nice weather and low pressure mean rain? Weather you’d like to know [15]
Generally high pressure means fair weather, and low pressure means rain. This weather map shows areas of high and low pressure
CLEVELAND, Ohio – You’re standing at the surface looking up into the sky, and it doesn’t seem like much, right? But high in the atmosphere are vertical movements of air, which dictate the weather conditions we see at the surface.. These vertical movements of air are what cause high or low pressure.
(credit: National Oceanic and Atmospheric Administration). As air is forced downward, its pressure increases as it gets closer and closer to the surface because pressure decreases as you go up in the atmosphere.
basics: High Pressure Systems, Low Pressure Systems [16]
ENVIRONMENTAL SCIENCE PUBLISHED FOR EVERYBODY ROUND THE EARTH. Air always flows from areas of high pressure to areas of low pressure to try to reduce pressure differences and reach equilibrium
Rather the winds move in a spiral: inwards and upwards in low pressure systems, downwards and outwards in high pressure systems.. Regions of rising air are called lows, low pressure systems, depressions or cyclones
Cloudy conditions, windy weather, rain and snow and unsettled changable weather often occur in these regions.. In cyclones, the winds move anti-clockwise around a low pressure centre in the northern hemisphere
Pressure Systems & Fronts [17]
On this week’s Weather Wonders episode, Jack asked, “Why do we have different weather changes?”. To answer this question, we have to look at high and low pressure systems, as well as, warm and cold fronts and the modifications they make to the airmass around us.
The black lines surrounding the high and low pressure systems are isobars or lines of equal pressure. It will increase as you move toward the center of the high pressure and the opposite occurs for the low
The change in pressure is the pressure gradient and it resembles the difference in pressure between the high and low. Wind speed is proportional to the change in pressure
Is High Pressure Always Warm Air? [18]
High pressure systems can be cold or warm, humid or dry. The origin of a high-pressure region determines its weather characteristics.
If the high pressure originates from the north, it will generally bring cold or cooler weather.. When high pressures form, they adopt the characteristics of the source regions over which they form
Warm air masses are of subtropical or tropical origin; both are referred to as tropical air masses.. Air masses that form over water are referred to as maritime, whereas those generated over continents are referred to as continental
Sources
- https://en.wikipedia.org/wiki/Low-pressure_area#:~:text=Low%2Dpressure%20areas%20are%20commonly,lighter%20winds%20and%20clear%20skies.
- https://scied.ucar.edu/learning-zone/how-weather-works/highs-and-lows-air-pressure#:~:text=A%20low%20pressure%20system%20has,forming%20clouds%20and%20often%20precipitation.
- https://www.americangeosciences.org/education/k5geosource/content/weather/why-is-the-weather-different-in-high-and-low-pressure-areas#:~:text=Low%2Dpressure%20areas%20are%20places,to%20be%20well%2Dorganized%20storms.
- https://www.linkedin.com/pulse/5-effects-barometric-pressure-has-humans-you-really-can-pedram-shojai#:~:text=Atmospheric%20(barometric)%20pressure%20goes%20down,clear%2C%20humidity%20drops%2C%20etc.
- https://en.wikipedia.org/wiki/Pressure_system#:~:text=Low%2Dpressure%20systems%20are%20associated,greater%20sunshine%20during%20the%20day.
- https://www.metoffice.gov.uk/weather/learn-about/weather/how-weather-works/high-and-low-pressure
- https://scied.ucar.edu/learning-zone/how-weather-works/highs-and-lows-air-pressure
- https://weatherworksinc.com/news/high-low-pressure
- https://www.wdtv.com/content/news/High-pressure-versus-low-pressure–What-does-each-bring-weather-wise-449142513.html
- https://www.americangeosciences.org/education/k5geosource/content/weather/why-is-the-weather-different-in-high-and-low-pressure-areas
- https://sciencing.com/weather-occurs-during-high-pressure-system-23025.html
- https://www.whsv.com/content/news/Weather-Questions-April-8-2019-508071741.html
- https://a-z-animals.com/blog/high-pressure-and-low-pressure-what-does-it-mean-for-weather/
- https://www.foxweather.com/learn/why-is-atmospheric-pressure-so-important-to-the-forecast
- https://www.cleveland.com/weather/blog/2016/09/why_does_high_pressure_mean_ni.html
- https://open.uj.edu.pl/mod/page/view.php?id=1364
- https://www.kwwl.com/archive/pressure-systems-fronts/article_4d532875-82f9-52b8-a591-71d2202f8db6.html
- https://wxguys.ssec.wisc.edu/2011/08/07/is-high-pressure-always-warm-air/
