Foehn wind environment with strong and gusty winds. Explanations of the foehn warming and drying effect in popular literature or on the web often single out just one causal mechanism (#1 - Condensation and Precipitation - in the below), but there are in fact four known causes (illustrated in the schematic at top right of this page). These mechanisms often act together, with their contributions varying depending on the size and shape of the mountain barrier and on the meteorological conditions, for example the upstream wind speed, temperature and humidity. 1) Condensation and precipitation: When air is forced upwards over elevated terrain,
Antarctica Weather Danger Classification reaching Condition 2 based on windchill values of or below do happen. And reaching Condition 1 based on windchill values of or colder does occur. Antarctica Weather Danger Classification The weather in Antarctica can be highly variable, and weather conditions will oftentimes change dramatically in a short period of time. There are various classifications for describing weather conditions in Antarctica; restrictions given to workers during the different conditions vary by station and nation. An air temperature of or below would meet the criteria for Condition 2. And an air temperature of or colder would meet the criteria for Condition 1.