Atmospheric pressure today

Atmospheric pressure today DEFAULT

Surface pressure charts showing pressure and weather fronts are provided up to five days ahead for Europe and the North East Atlantic.

We do not have a text alternative for our surface pressure charts. However, you can view our UK 5 day forecast for an overview of the national conditions here.

These charts show the surface pressure pattern using isobars (lines of equal pressure) and indicate areas of high (H) and low pressure (L) along with their central pressure value. Isobars are represented by solid lines. High pressure is usually associated with settled weather while low pressure is normally associated with unsettled weather. Fronts are also displayed. An analysis chart, which shows the observed state of the weather, is issued along with forecast charts up to five days ahead. These are updated every 12 hours around 0730 UTC and 1930 UTC, with the exception of charts for days four and five which are only issued once per day at 1930 UTC. The reason that these two charts are only issued once a day is because that far ahead the forecast surface pressure pattern will change more significantly, due to uncertainty at this longer time period, and there is limited value in updating it every 12 hours.

Sours: https://www.metoffice.gov.uk/weather/maps-and-charts/surface-pressure

ATMOSPHERIC PRESSUREHong Kong

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Forecast in Hong Kong for the next 7 days

FORECAST• 7 DAYS

ATMOSPHERIC PRESSURE
	WEATHER FORECAST

ATMOSPHERIC PRESSUREHONG KONG

NEXT 7 DAYS

15OCT

FridayAtmospheric pressure in Hong Kong

MAX. PRESSURE

1013 hPa

MIN. PRESSURE

1008 hPa

16OCT

SaturdayAtmospheric pressure in Hong Kong

MAX. PRESSURE

1017 hPa

MIN. PRESSURE

1011 hPa

17OCT

SundayAtmospheric pressure in Hong Kong

MAX. PRESSURE

1019 hPa

MIN. PRESSURE

1016 hPa

18OCT

MondayAtmospheric pressure in Hong Kong

MAX. PRESSURE

1019 hPa

MIN. PRESSURE

1016 hPa

19OCT

TuesdayAtmospheric pressure in Hong Kong

MAX. PRESSURE

1019 hPa

MIN. PRESSURE

1016 hPa

20OCT

WednesdayAtmospheric pressure in Hong Kong

MAX. PRESSURE

1017 hPa

MIN. PRESSURE

1014 hPa

21OCT

ThursdayAtmospheric pressure in Hong Kong

MAX. PRESSURE

1015 hPa

MIN. PRESSURE

1012 hPa

FISHING SITES CLOSE TO HONG KONG

atmospheric pressure in Victoria Harbour(2.5 km)|atmospheric pressure in Aberdeen Harbor(5 km)|atmospheric pressure in Tai Tam Bay(8 km)|atmospheric pressure in Tide Cove(13 km)|atmospheric pressure in Port Shelter(15 km)|atmospheric pressure in Kapshui Mun(16 km)|atmospheric pressure in West Brother(23 km)|atmospheric pressure in Jones Cove(26 km)|atmospheric pressure in Wai-ling-ting(26 km)|atmospheric pressure in Peng Chau(39 km)|atmospheric pressure in Tu-mi-an(50 km)|atmospheric pressure in Wen Wei Rock(58 km)

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Sours: https://tides4fishing.com/as/china/hong-kong/forecast/atmospheric-pressure
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Location Wind Weather Temp Humidity Rain Pressure
DirSpeed Kts(Km/h)Gust Kts(Km/h)oC(%)(mm)(hPa)
Athenry NE06 (11) - (-) Cloudy10890.01021
Ballyhaise N02 (4) - (-) Recent Fog3970.01022
Belmullet E06 (11) - (-) Fair7920.01022
Casement NE05 (9) - (-) Cloudy9850.01022
Claremorris NE04 (7) - (-) -8870.01022
Cork NW04 (7) - (-) Fog thickening10990.011021
Dublin N06 (11) - (-) Fair7860.01022
Dunsany NE02 (4) - (-) -6930.01022
Finner SW01 (2) - (-) Rain shower3970.011022
Gurteen N04 (7) - (-) Cloudy9940.01021
Johnstown Castle N04 (7) - (-) Rain shower11960.11020
Knock NE05 (9) - (-) Sun/Clear sky6890.01022
Mace Head E12 (22) - (-) Cloudy10870.01021
Malin Head N10 (19) - (-) Cloudy10570.01022
Markree Castle -- (-) - (-) -1990.01022
Moore Park CALM (-) - (-) -9980.01020
Mt Dillon N03 (6) - (-) -5960.01022
Mullingar N01 (2) - (-) Fair7920.01022
Newport Mayo E04 (7) - (-) -8740.01022
Oak Park N04 (7) - (-) Cloudy10930.01021
Phoenix Park -- (-) - (-) -9810.01022
Roche's Point N05 (9) - (-) Mist10970.11020
Shannon NE05 (9) - (-) Light Drizzle 12970.11021
Sherkin Island NE05 (9) - (-) Fog9990.11020
Valentia NE02 (4) - (-) Fog thickening9990.01020

Notes on the Data

Above is based on the LATEST observations received.

  • Pressure is atmospheric pressure at Mean Sea Level.
  • ‘X’ or ‘-‘ mean that the element is not measured.
  • ‘n/a’ means that the element is not available at present.
  • Gust in Today’s Weather are displayed in km/h when there is a wind speed >10km/h higher than the average for that hour.
  • Gust in Latest Weather Reports is the highest gust of wind in knots of 21 knots or greater. If no Gusts  – (-) will display.

The data presented on this page are the latest available for each station. These data are presented here soon after the time of measurement and have not been subjected to extensive checking. Many of the measurements come from automated instruments with no human supervision. These are generally very reliable but, as with any system, human or automatic, errors can happen from time to time. During automatic operation, the “Weather” is estimated by an optical instrument. Classification of weather-type is significantly more difficult than measuring temperature or pressure and the result is occasionally incorrect. In particular, you may see a very occasional report of snow during periods of foggy weather.

Any measurement must be viewed in the context of the other parameters measured at the same time, both at the same station and at other neighbouring stations.

Sours: https://www.met.ie/latest-reports/observations

What is this?

This is the only web application dedicated to showing barometric pressure histories, forecasts and maps for any location in the world.

Who is this for?

Humans: Barometric pressure fluctuations can lead to migraine headaches, joint pain, arthritis symptoms, and blood pressure changes among other physical changes in the human body. Some people can predict weather patterns due to their bodies’ responses to changes in pressure. It can help to know in advance when the pressure will change in order to make lifestyle or medication adjustments beforehand, which is where this forecast graph can be helpful!

Meteorologists: Barometric pressure, also known as atmospheric pressure, is a leading indicator for inclement weather. Generally, low pressure systems are associated with cooler temperatures, precipitation, wind and storms.

Fishermen: Some fish respond to changes in barometric pressure and can change their level of feeding activity when pressure is dropping. Thus, fishermen might avoid fishing when pressure is dropping and seek out times to fish before or after those periods.

Where does this data come from?

The weather data come from a combination of the Tomorrow and Dark Sky weather APIs. The map view is from Windy.com. If the data in your area are inaccurate or unavailable, that’s probably an issue with a data source, but please let us know by leaving a feedback message (at the bottom of the page) so we can check on it!

Is there a mobile app?

There is not a mobile app version at the moment, but it is quite easy to save this page as a bookmark in your device’s home screen and access it like any other app you download. Click on the links below for instructions:

For Android users

For iPhone/iPad users

The app is not working for me. What should I do?

We apologize for that. We are running this app on a shoestring budget while we’re trying to get it off the ground, so sometimes we hit our allotted data limits with our data providers. Check back again after some time and it should work. Either way, please leave us some feedback so we can help if you are experiencing problems by clicking on the “Feedback” link, below.

How can I support the maintenance and further development of this app?

The best way to support us is to share your feedback. Tell us what you like, dislike, and would like to see in the future! You may also make a donation by clicking on the "Buy Me a Coffee" button below. Between the costs of hosting and data, this website does require some money to keep running each month, and donors like you help make that easier. Thank you!


Sours: https://barometricpressure.app/

Pressure today atmospheric

Atmospheric pressure

Static pressure exerted by the weight of the atmosphere

"Air pressure" redirects here. For the pressure of air in other systems, see Pressure.

Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa; 1,013.25 mbar), which is equivalent to 760 mm Hg, 29.9212 inches Hg, or 14.696 psi.[1] The atm unit is roughly equivalent to the mean sea-level atmospheric pressure on Earth; that is, the Earth's atmospheric pressure at sea level is approximately 1 atm.

In most circumstances, atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. As elevation increases, there is less overlying atmospheric mass, so that atmospheric pressure decreases with increasing elevation. Because the atmosphere is thin relative to the Earth's radius—especially the dense atmospheric layer at low altitudes—the Earth's gravitational acceleration as a function of altitude can be approximated as constant and contributes little to this fall off. Pressure measures force per unit area, with SI units of pascals (1 pascal = 1 newton per square metre, 1 N/m2). On average, a column of air with a cross-sectional area of 1 square centimetre (cm2), measured from mean (average) sea level to the top of Earth's atmosphere, has a mass of about 1.03 kilogram and exerts a force or "weight" of about 10.1 newtons, resulting in a pressure of 10.1 N/cm2 or 101 kN/m2 (101 kilopascals, kPa). A column of air with a cross-sectional area of 1 in2 would have a weight of about 14.7 lbf, resulting in a pressure of 14.7 lbf/in2.

Mechanism[edit]

Atmospheric pressure is caused by the gravitational attraction of the planet on the atmospheric gases above the surface and is a function of the mass of the planet, the radius of the surface, and the amount and composition of the gases and their vertical distribution in the atmosphere.[2][3] It is modified by the planetary rotation and local effects such as wind velocity, density variations due to temperature and variations in composition.[4]

Mean sea-level pressure[edit]

Map showing atmospheric pressure in mbar or hPa
15-year average mean sea-level pressure for June, July, and August (top) and December, January, and February (bottom). ERA-15re-analysis.
Kollsman-type barometric aircraft altimeter(as used in North America) displaying an altitudeof 80 ft (24 m), calibrated for 29.92 inHg sea-level pressure.

The mean sea-level pressure (MSLP) is the atmospheric pressure at mean sea level (PMSL). This is the atmospheric pressure normally given in weather reports on radio, television, and newspapers or on the Internet. When barometers in the home are set to match the local weather reports, they display pressure adjusted to sea level, not the actual local atmospheric pressure.

The altimeter setting in aviation is an atmospheric pressure adjustment.

Average sea-level pressure is 1013.25 mbar (101.325 kPa; 29.921 inHg; 760.00 mmHg). In aviation, weather reports (METAR), QNH is transmitted around the world in millibars or hectopascals (1 hectopascal = 1 millibar), except in the United States, Canada, and Colombia where it is reported in inches of mercury (to two decimal places). The United States and Canada also report sea-level pressure SLP, which is adjusted to sea level by a different method, in the remarks section, not in the internationally transmitted part of the code, in hectopascals or millibars.[5] However, in Canada's public weather reports, sea level pressure is instead reported in kilopascals.[6]

In the US weather code remarks, three digits are all that are transmitted; decimal points and the one or two most significant digits are omitted: 1013.2 mbar (101.32 kPa) is transmitted as 132; 1000.0 mbar (100.00 kPa) is transmitted as 000; 998.7 mbar is transmitted as 987; etc. The highest sea-level pressure on Earth occurs in Siberia, where the Siberian High often attains a sea-level pressure above 1050 mbar (105 kPa; 31 inHg), with record highs close to 1085 mbar (108.5 kPa; 32.0 inHg). The lowest measurable sea-level pressure is found at the centers of tropical cyclones and tornadoes, with a record low of 870 mbar (87 kPa; 26 inHg).

Surface pressure [edit]

"Surface pressure" redirects here. For surface pressure in physical chemistry, see Pressure § Surface pressure and surface tension.

Surface pressure is the atmospheric pressure at a location on Earth's surface (terrain and oceans). It is directly proportional to the mass of air over that location.

For numerical reasons, atmospheric models such as general circulation models (GCMs) usually predict the nondimensional logarithm of surface pressure.

The average value of surface pressure on Earth is 985 hPa.[7] This is in contrast to mean sea-level pressure, which involves the extrapolation of pressure to sea-level for locations above or below sea-level. The average pressure at mean sea-level (MSL) in the International Standard Atmosphere (ISA) is 1013.25 hPa, or 1 atmosphere (atm), or 29.92 inches of mercury.

Pressure (p), mass (m), and the acceleration due to gravity (g), are related by P = F/A = (m*g)/A, where A is surface area. Atmospheric pressure is thus proportional to the weight per unit area of the atmospheric mass above that location.

Altitude variation[edit]

Further information: Barometric formula and Vertical pressure variation

Variation in atmospheric pressure with altitude, computed for 15 °C and 0% relative humidity.
This plastic bottle was sealed at approximately 14,000 feet (4,300 m) altitude, and was crushed by the increase in atmospheric pressure, recorded at 9,000 feet (2,700 m) and 1,000 feet (300 m), as it was brought down towards sea level.

Pressure on Earth varies with the altitude of the surface; so air pressure on mountains is usually lower than air pressure at sea level. Pressure varies smoothly from the Earth's surface to the top of the mesosphere. Although the pressure changes with the weather, NASA has averaged the conditions for all parts of the earth year-round. As altitude increases, atmospheric pressure decreases. One can calculate the atmospheric pressure at a given altitude.[8] Temperature and humidity also affect the atmospheric pressure. Pressure is proportional to temperature and inversely proportional to humidity. And it is necessary to know both of these to compute an accurate figure. The graph on the rightabove was developed for a temperature of 15 °C and a relative humidity of 0%.

At low altitudes above sea level, the pressure decreases by about 1.2 kPa (12 hPa) for every 100 metres. For higher altitudes within the troposphere, the following equation (the barometric formula) relates atmospheric pressure p to altitude h: {\displaystyle {\begin{aligned}p&=p_{0}\cdot \left(1-{\frac {L\cdot h}{T_{0}}}\right)^{\frac {g\cdot M}{R_{0}\cdot L}}\\&=p_{0}\cdot \left(1-{\frac {g\cdot h}{c_{\text{p}}\cdot T_{0}}}\right)^{\frac {c_{\text{p}}\cdot M}{R_{0}}}\approx p_{0}\cdot \exp \left(-{\frac {g\cdot h\cdot M}{T_{0}\cdot R_{0}}}\right)\end{aligned}}}

where the constant parameters are as described below:

ParameterDescriptionValue
p0Sea level standard atmospheric pressure101325 Pa
LTemperature lapse rate, = g/cp for dry air~ 0.00976 K/m
cpConstant-pressure specific heat1004.68506 J/(kg·K)
T0Sea level standard temperature288.16 K
gEarth-surface gravitational acceleration9.80665 m/s2
MMolar mass of dry air0.02896968 kg/mol
R0Universal gas constant8.314462618 J/(mol·K)

Local variation[edit]

Hurricane Wilmaon 19 October 2005; 882 hPa (12.79 psi) in the storm's eye

Atmospheric pressure varies widely on Earth, and these changes are important in studying weather and climate. See pressure system for the effects of air pressure variations on weather.

Atmospheric pressure shows a diurnal or semidiurnal (twice-daily) cycle caused by global atmospheric tides. This effect is strongest in tropical zones, with an amplitude of a few millibars, and almost zero in polar areas. These variations have two superimposed cycles, a circadian (24 h) cycle and semi-circadian (12 h) cycle.

Records[edit]

The highest adjusted-to-sea level barometric pressure ever recorded on Earth (above 750 meters) was 1084.8 hPa (32.03 inHg) measured in Tosontsengel, Mongolia on 19 December 2001.[9] The highest adjusted-to-sea level barometric pressure ever recorded (below 750 meters) was at Agata in Evenk Autonomous Okrug, Russia (66°53' N, 93°28' E, elevation: 261 m, 856 ft) on 31 December 1968 of 1083.8 hPa (32.005 inHg).[10] The discrimination is due to the problematic assumptions (assuming a standard lapse rate) associated with reduction of sea level from high elevations.[9]

The Dead Sea, the lowest place on Earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hPa.[11] A below-sea-level surface pressure record of 1081.8 hPa (31.95 inHg) was set on 21 February 1961.[12]

The lowest non-tornadic atmospheric pressure ever measured was 870 hPa (0.858 atm; 25.69 inHg), set on 12 October 1979, during Typhoon Tip in the western Pacific Ocean. The measurement was based on an instrumental observation made from a reconnaissance aircraft.[13]

Measurement based on depth of water[edit]

One atmosphere (101.325 kPa or 14.7 psi) is also the pressure caused by the weight of a column of fresh water of approximately 10.3 m (33.8 ft). Thus, a diver 10.3 m underwater experiences a pressure of about 2 atmospheres (1 atm of air plus 1 atm of water). Conversely, 10.3 m is the maximum height to which water can be raised using suction under standard atmospheric conditions.

Low pressures such as natural gas lines are sometimes specified in inches of water, typically written as w.c. (water column) gauge or w.g. (inches water gauge). A typical gas-using residential appliance in the US is rated for a maximum of 1/2 psi, which is approximately 14 w.g. (3487 Pa or 34.9 millibars). Similar metric units with a wide variety of names and notation based on millimetres, centimetres or metres are now less commonly used.

Boiling point of water[edit]

Pure water boils at 100 °C (212 °F) at earth's standard atmospheric pressure. The boiling point is the temperature at which the vapor pressure is equal to the atmospheric pressure around the water.[14] Because of this, the boiling point of water is lower at lower pressure and higher at higher pressure. Cooking at high elevations, therefore, requires adjustments to recipes[15] or pressure cooking. A rough approximation of elevation can be obtained by measuring the temperature at which water boils; in the mid-19th century, this method was used by explorers.[16]

Measurement and maps[edit]

An important application of the knowledge that atmospheric pressure varies directly with altitude was in determining the height of hills and mountains thanks to the availability of reliable pressure measurement devices. In 1774, Maskelyne was confirming Newton's theory of gravitation at and on Schiehallion mountain in Scotland, and he needed to accurately measure elevations on the mountain's sides. William Roy, using barometric pressure, was able to confirm Maskelyne's height determinations, the agreement being to within one meter (3.28 feet). This method became and continues to be useful for survey work and map making.[17]

See also[edit]

References[edit]

  1. ^International Civil Aviation Organization. Manual of the ICAO Standard Atmosphere, Doc 7488-CD, Third Edition, 1993. ISBN 92-9194-004-6.
  2. ^"atmospheric pressure (encyclopedic entry)". National Geographic. Archived from the original on 28 February 2018. Retrieved 28 February 2018.
  3. ^"Q & A: Pressure – Gravity Matters?". Department of Physics. University of Illinois Urbana-Champaign. Archived from the original on 28 February 2018. Retrieved 28 February 2018.
  4. ^Jacob, Daniel J. (1999). Introduction to Atmospheric Chemistry. Princeton University Press. ISBN . Archived from the original on 2021-10-01. Retrieved 2020-10-15.
  5. ^Sample METAR of CYVRArchived 2019-05-25 at the Wayback Machine Nav Canada
  6. ^Montreal Current Weather, CBC Montreal, Canada, archived from the original on 2014-03-30, retrieved 2014-03-30
  7. ^Jacob, Daniel J. Introduction to Atmospheric ChemistryArchived 2020-07-25 at the Wayback Machine. Princeton University Press, 1999.
  8. ^A quick derivation relating altitude to air pressureArchived 2011-09-28 at the Wayback Machine by Portland State Aerospace Society, 2004, accessed 05032011
  9. ^ abWorld: Highest Sea Level Air Pressure Above 750 m, Wmo.asu.edu, 2001-12-19, archived from the original on 2012-10-17, retrieved 2013-04-15
  10. ^World: Highest Sea Level Air Pressure Below 750 m, Wmo.asu.edu, 1968-12-31, archived from the original on 2013-05-14, retrieved 2013-04-15
  11. ^Kramer, MR; Springer C; Berkman N; Glazer M; Bublil M; Bar-Yishay E; Godfrey S (March 1998). "Rehabilitation of hypoxemic patients with COPD at low altitude at the Dead Sea, the lowest place on earth"(PDF). Chest. 113 (3): 571–575. doi:10.1378/chest.113.3.571. PMID 9515826. Archived from the original(PDF) on 2013-10-29.
  12. ^Court, Arnold (1969). "Improbable Pressure Extreme: 1070 Mb". Bulletin of the American Meteorological Society. 50 (4): 248–50. JSTOR 26252600.
  13. ^Chris Landsea (2010-04-21). "Subject: E1), Which is the most intense tropical cyclone on record?". Atlantic Oceanographic and Meteorological Laboratory. Archived from the original on 6 December 2010. Retrieved 2010-11-23.
  14. ^Vapour Pressure, Hyperphysics.phy-astr.gsu.edu, archived from the original on 2017-09-14, retrieved 2012-10-17
  15. ^High Altitude Cooking, Crisco.com, 2010-09-30, archived from the original on 2012-09-07, retrieved 2012-10-17
  16. ^Berberan-Santos, M. N.; Bodunov, E. N.; Pogliani, L. (1997). "On the barometric formula". American Journal of Physics. 65 (5): 404–412. Bibcode:1997AmJPh..65..404B. doi:10.1119/1.18555.
  17. ^Hewitt, Rachel, Map of a Nation – a Biography of the Ordnance SurveyISBN 1-84708-098-7

External links[edit]

Experiments[edit]

Sours: https://en.wikipedia.org/wiki/Atmospheric_pressure
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