Upslopenevel

Upslopenevel is a Dutch term that literally translates to "uphill fog." It describes a meteorological phenomenon where fog or mist appears to be moving uphill, against the natural direction of gravity. This effect is primarily caused by wind currents that are strong enough to push the fog layer up inclines. Several factors can contribute to the appearance of upslopenevel. The most common reason is a prevailing wind blowing from a lower elevation towards a higher one. As the wind encounters a slope, it can lift the fog or mist along with it. Additionally, temperature inversions can play a role. In such inversions, a layer of warmer air sits above a layer of cooler air. If fog forms in the cooler air near the ground, a strong upslope wind can push this cooler, fog-laden air into the warmer layer, creating the visual impression of upward movement. Upslopenevel is often observed in hilly or mountainous regions, particularly along coastlines where moist air is abundant and onshore winds are common. The phenomenon can be quite striking, creating a visual illusion of fog defying gravity. It is a temporary condition, typically dissipating as wind patterns change or the temperature inversion breaks.