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Blocks in meteorology are large scale patterns in the atmospheric pressure field that are nearly stationary, effectively "blocking" or redirecting migratory cyclones. They are also known as blocking highs or blocking anticyclones.[1] These blocks can remain in place for several days or even weeks, causing the areas affected by them to have the same kind of weather for an extended period of time (e.g.- precipitation for some areas, clear skies for others).[2] In the Northern Hemisphere, extended blocking occurs most frequently in the spring over the eastern Pacific and Atlantic oceans. [1] World map showing North America A satellite composite image of North America. ...
Satellite image of Hurricane Hugo with a polar low visible at the top of the image. ...
Diurnal (daily) rhythm of air pressure in northern Germany (black curve is air pressure) Atmospheric pressure is the pressure at any point in the Earths atmosphere. ...
This article is about the meteorological phenomenon. ...
A high, or a high pressure area, is a region where the atmospheric pressure is greatest with relation to the surrounding area. ...
In meteorology, an anticyclone (i. ...
Insert non-formatted text here The Northern Hemisphere is the half of a planets surface (or celestial sphere) that is north of the equator (the word hemisphere literally means half ball). On the Earth, the Northern Hemisphere contains most of the land and population. ...
Spring is one of the four seasons of temperate zones. ...
For other meanings of Pacific, see Pacific (disambiguation). ...
The Atlantic Ocean is Earths second-largest ocean, covering approximately one_fifth of its surface. ...
Omega blocks
Omega blocks are so-named because the height fields associated with them resemble the Greek letter omega. The typical pattern for this is low-high-low, arranged in the west-east direction.[2] Technical note: Due to technical limitations, some web browsers may not display some special characters in this article. ...
Rex blocks Rex blocks consist of a high situated to the north of a low. Very often both the high and the low are closed, meaning that the isobars (or constant geopotential height lines) defining the high/low close to form a circle.[3] Rex blocks are not so-named because they are considered the "king of blocks" (see Rex), but rather they were named after the meteorologist who first identified them.[4] Isobar - Wikipedia, the free encyclopedia /**/ @import /skins-1. ...
Geopotential height is a vertical coordinate referenced to Earths mean sea level - an adjustment to geometric height (elevation above mean sea level) using the variation of gravity with latitude and elevation. ...
Rex (Latin for king; see also Roman king, raja) is the name of several things. ...
See also Geopotential height is a vertical coordinate referenced to Earths mean sea level - an adjustment to geometric height (elevation above mean sea level) using the variation of gravity with latitude and elevation. ...
A ridge is an elongated region of relatively high atmospheric pressure, the opposite of a trough. ...
A trough is an elongated region of relatively low atmospheric pressure, often associated with fronts. ...
References - ^ a b Glossary of Meteorology, Second Edition; American Meteorlogical Society, 2000; ISBN 1-878220-34-9.
- ^ a b Brief page about Omega blocks
- ^ Brief page about Rex blocks
- ^ Another Rex Block page
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