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30.52 in Pressure--UV Index. 3:51PM Sunset. ... Today's top weather news for Wednesday, Dec. 11, 2024: Millions of people along the East Coast are bracing for severe weather, strong winds and ...
Atmospheric pressure, also known as air pressure or 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 ), which is equivalent to 1,013.25 millibars , [ 1 ] 760 mm Hg , 29.9212 inches Hg , or 14.696 psi . [ 2 ]
The 20th Century low pressure record onshore in the UK occurred on 20 December 1982 at Sule Skerry dropping as low as 936 hPa. 937.6 hPa was recorded at Stornoway on 20 December 1982 as the lowest barometric pressure observed anywhere in the British Isles since 1886. 931 [88] 1983, 5 January South of Iceland,
The general synopsis follows, giving the position, pressure (in millibars) and track of pressure areas (e.g., "Low, Rockall, 987, deepening rapidly, expected Fair Isle 964 by 0700 tomorrow"). With the information provided in the Shipping Forecast it is possible to compile a pressure chart for the coasts of northwestern Europe.
When atmospheric pressure is measured by a barometer, the pressure is also referred to as the "barometric pressure". Assume a barometer with a cross-sectional area A, a height h, filled with mercury from the bottom at Point B to the top at Point C. The pressure at the bottom of the barometer, Point B, is equal to the atmospheric pressure.
Highest monthly total (UK national average) [11] 266 hours UK (national average) May 2020 Highest monthly total (England) [2] 383.9 hours Eastbourne, Sussex: July 1911 Highest monthly total (Northern Ireland) [2] 298 hours Mount Stewart, County Down: June 1940 Highest monthly total (Scotland) [2] 329.1 hours Tiree, Argyll & Bute: May 1975
Measurements of barometric pressure and the pressure tendency (the change of pressure over time) have been used in forecasting since the late 19th century. [66] The larger the change in pressure, especially if more than 3.5 hPa (2.6 mmHg), the larger the change in weather can be expected.
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