kokonaissumua

Kokonaissumua is a Finnish term that translates to "total fog" or "complete fog." It describes a dense atmospheric condition where visibility is severely reduced, often to less than 200 meters. This type of fog can form under various conditions, typically when the air cools to its dew point, causing water vapor to condense into tiny droplets suspended in the air.

Common causes of kokonaissumua include radiation fog, which forms on clear, calm nights when the ground cools rapidly, and advection fog, which occurs when warm, moist air moves over a cooler surface. Coastal areas and valleys are particularly prone to experiencing kokonaissumua due to specific temperature and moisture gradients.

The effects of kokonaissumua can be significant, impacting transportation, particularly air and road travel, leading to delays and hazardous conditions. It can also affect outdoor activities and, in some cases, contribute to a feeling of isolation or disorientation. While often a natural phenomenon, human activities like increased humidity from industrial processes can sometimes exacerbate fog formation.