Berg wind

(Literally, mountain wind.) A hot, dry, squally wind blowing off the interior plateau of South Africa, roughly at right angles to the coast; a type of foehn.
Berg winds blow mainly in winter, when a strong anticyclone occupies the interior plateau, producing outflow across the coastal regions of South Africa. They are especially frequent and noticeable on the cool west coast, where they set in suddenly during the morning, bring a temperature rise of 15°–20°C, giving maxima of 22°–35°C, and cause the relative humidity to fall from nearly 100% to 30% or less. Here, on days when the sea breeze sets in about noon, the temperature drops by 10°–16°C even more suddenly than it had risen at the onset of the berg wind. Berg wind episodes may last two to three days, causing uncomfortable weather for people and damage to crops. At Port Nolloth in southwest Africa, berg winds occur on an average of 48 days a year, June and July having nine each and the whole summer half-year (October through March) a total of only six.
See hot wind;
compare mountain wind.

viento Berg

(Literalmente, significa viento de montaña). Es un viento cálido, seco y borrascoso que sopla desde la meseta interior de Sudáfrica, aproximadamente en ángulos rectos con la costa; un tipo de viento Foehn.

Los vientos Berg soplan principalmente en invierno, cuando un anticiclón fuerte ocupa la meseta interior y produce una corriente de salida a lo largo de las regiones costeras de Sudáfrica. Son especialmente frecuentes y evidentes en la fría costa occidental, donde comienzan repentinamente durante la mañana, provocan un aumento de la temperatura de 15 a 20 °C, con máximos de 22 a 35 °C, y provocan que la humedad relativa caiga de casi el 100 % al 30 % o menos. En este lugar, cuando la brisa marina comienza alrededor del mediodía, la temperatura desciende entre 10 y 16 °C incluso más repentinamente de lo que había subido al inicio del viento Berg. Los episodios de viento Berg pueden durar entre dos y tres días, provocando un clima incómodo para las personas y daños a los cultivos. En Port Nolloth, en el suroeste de África, los vientos Berg ocurren en un promedio de 48 días al año, con nueve días en junio y nueve en julio, y un total de solo seis durante el medio año de verano (octubre a marzo).
Consulte vientos calientes;
compare con viento de montaña.

1. Commonly used abbreviation for iceberg.

(Or föhn.) A warm, dry, downslope wind descending the lee side of the Alps as a result of synoptic-scale, cross-barrier flow over the mountain range.
The winds are often strong and gusty, sometimes forming downslope windstorms as a result of mountain wave activity. The air in the near-surface flow originates at or above the main crest height of the Alpine barrier, and achieves its warmth and dryness as a result of adiabatic descent. The foehn often replaces a retreating cold air mass from a polar or arctic front, producing dramatic temperature rises that reach 10°C and occasionally even 20°C or more, sometimes in a matter of minutes. This is especially true of the south foehn, which blows from northern Italy, where the air is warm, to the north of the Alps (Austria, Germany, Switzerland), where the air is cooler and could be cold arctic air as just described. The north foehn, blowing from a cooler to a warmer region, produces less dramatic temperature changes. The air in the foehn, originating from the mid troposphere, is characteristically clean. Its warm temperatures rapidly melt (or sublimate) snow, sometimes producing flooding, and the extreme dryness can lead to dangerous fire weather conditions. The Alpine foehn has been extensively studied by European scientists, and it is recognized as the type wind for similar downslope winds, resulting from cross-barrier flow, in other parts of the world. In other mountain ranges the foehn has a variety of local names, including chinook in the Rocky Mountains in North America; zonda for a westerly foehn from the Argentine Andes; ljuka in Carthinia (northwestern Croatia); halny wiatr in Poland; austru in Romania; and favogn in Switzerland. A northeasterly foehn descending the Massif Central in France and extending over the Garonne Plain is locally called aspre. A dry wind from the northwest descending the coastal hills in Majorca is named the sky sweeper. In New Zealand a foehn blowing from the New Zealand Alps onto the Canterbury Plains is the Canterbury northwester. A cross- barrier flow that produces strong winds and cooling is called a bora in many parts of the world. Many authors have attempted to classify strong wind events as foehn (or chinook) or bora, for example, for climatologies. These studies have had mixed success: Many wind events are easy to classify, but a number of events are difficult, depending on the data available (most studies attempt to use surface data) and the method used to differentiate between the two types of events.
See foehn phase, high foehn.
Defant, F. 1951. Compendium of Meteorology. 667–669.