Block (meteorology)

The omega position, even high Omega is a weather situation, which is characterized by a large area of ​​high pressure, which in turn of two height lows, one west and one east of it is flanked. This constellation is high pressure as stable in any season in both in the low- pressure area over comparatively long periods of time. The resulting pressure formations reminiscent of the capital letter omega Ω, and therefore takes its name.

Meteorology

As seen from above, rotate the omega position determining high- clockwise and the two lows counterclockwise strengthen all three together, and block each other in the west drift, so that the omega position is characterized by a certain stability, and there is a weather forecast ("do not change in perspective " ) over a longer period than the usual three or six days possible. So the omega position causes in the area of ​​high-pressure area is a typical summer fine weather with a pronounced drought and heat, while in winter minimum temperatures. However, heavy precipitation and severe weather - In the area of the two low-pressure areas, the Omega position leads - in summer and winter. Omega layers are not completely fixed, but move slowly. This may be followed by a long period of fine weather for a long period of bad weather, and vice versa.

Omega layers over central Europe

  • August / September 2002; after the floods on the Elbe in early August 2002, it was hot from mid-August to mid-September, sunny and dry.
  • Summer 2003, an omega position for the 2003 heat wave; in advance of this summer it came to fickle autumn weather in 2002 since December 2002 to several Omega layers, resulting in a cold, dry winter of 2002/2003, especially in northern and eastern Germany and several dry periods in spring and early summer of 2003.
  • Autumn 2005: after a rather eventful summer led several Omega documents from late August to mid-November to a very warm and sunny late summer and autumn, after sudden onset of winter with snow Munsterlander chaos.
  • Summer 2006: too cold and rainy before the 2006 World Cup - too hot and too dry during the World Cup - then back to cold and rainy; with changes in the weather in the first week of June and the first week of August.
  • In April 2007, an omega position was after a very long-lasting Vorwitterung with above-average temperatures for the same three records responsible: He was one of the sunniest, warmest and driest April also in Germany since records began the German Weather Service.
  • May 2008; by unstable weather in March and April of 2008, from late April to omega position, led to the driest May preceding particularly in eastern Germany and held into June at.
  • April 2009: After the cold winter of 2008/ 2009, and a wet and changeable in March 2009 continued to March 29, an omega position. It led, as in 2007, to a very warm, dry and sunny high spring with almost summery weather at Easter and another summer days in late April / early May and ended after five weeks duration at the May 3
  • Spring 2010: floods, a blocked Vb - weather conditions over Eastern Europe
  • Spring 2011: after an eventful winter 2010/2011 by record-breaking cold December 2010, and the mild, damp January 2011 came from mid-February 2011 to the formation of several anticyclones. Current weather conditions again led to an extremely warm April and total dry, sunny spring 2011. A storm period in early June ended this weather.
  • Fall 2011: after a rather eventful and thunderstorms summer of 2011, it came from mid-September to an increased formation of high pressure areas over central Europe. This resulted in early October to heat records, in the subsequent period they became increasingly blocking character with the peak in the driest November since over 100 years. November was still very sunny, apart from the fog areas, and due to a temperature inversion at higher altitudes very mild. The Omega situation ended abruptly when the month changes November / December.
  • Beginning of the year 2012: After a strong west wind situation in December 2011 and early January 2012, it came from mid-January again to an increasing high pressure formation. This resulted season typically to an increasing cooling of the air mass and the beginning of February to the cold wave in Europe in 2012., Even after the decline of the frost period mid-February the gravure influence remained weak, anticyclones regenerated again and again, leading to a very dry March with frequent temperature inversions, but also regional sunny and spring-like warm weather already.
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