Ridge (meteorology)
In
Description
Ridges can be represented in two ways:
- On surface isobarsform contours where the maximum pressure is found along the axis of the ridge.
- In upper-air maps, geopotential height isohypses form similar contours where the maximum defines the ridge.
Related weather
Given the direction of the winds around an anticyclonic circulation and the fact that weather systems move from west to east:[2]
- ahead of an upper-ridge, the airflow that comes from the polar regions and brings cold air.
- behind the upper-ridge line, the flow that comes from the equator and brings mild air.
Surface ridges, just like highs, generate fair weather because they develop under wind convergence in the
Subtropical ridge
An important atmospheric ridge is the
Ridge blocking
Blocks in meteorology are large-scale patterns in the atmospheric pressure field that are nearly stationary, effectively "blocking" or redirecting migratory cyclones. 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).[6] Upper ridges are often associated with such blocks, particularly in Omega blocks.[6]
References
- ^ American Meteorological Society. "Ridge". AMS Glossary. Retrieved August 2, 2019.
- ^ a b c Météo-France. "Dorsale". Glossaire (in French). Retrieved August 2, 2019.
- ^ Robert Tardif (2002). Fog characteristics. Archived 2011-05-20 at the Wayback Machine University Corporation for Atmospheric Research. Retrieved on 2007-02-11.
- ^ Myanmar government (2007). Haze. Archived 2008-02-24 at the Wayback Machine Retrieved on 2007-02-11.
- ^ C.-P. Chang, Yongsheng Zhang, and Tim Li (1999). Interannual and Interdecadal Variations of the East Asian Summer Monsoon and Tropical Pacific SSTs. Part I: Roles of the Subtropical Ridge. Journal of Climate: pp. 4310–4325. Retrieved on 2007-02-11.
- ^ a b "The Omega Block". theweatherprediction.com. Retrieved 27 July 2019.