Clear ice

As clear ice is called a fixed precipitation ( freezing rain, which is formed at an air temperature of typically -0 to -3 ° C from supercooled fog water droplets ) when it accumulates as free of turbidity ice on surfaces. Creates a rather diffuse structure with air pockets, it is called instead of rime. Both phenomena are to be distinguished from frozen dew, frost and hoarfrost.

Clear ice deposits as well as rime on branches and preferred to overhead lines where it can perform the additional weight load sometimes not inconsiderable damage. Due to its higher density and strength This risk is particularly pronounced in transparent ice.

Clear ice forms - if enough cold air - particularly strong on plant branches that grow at or above the open, at least gushing rivers, sporadic water splashes or spray from Wassergischt reached the branches and freezes there, the branches can thereby freeze so strong that they by weight be even closer to or partially dragged into the water of the ice, so that the lapped portion of the ice bank to melt off again. Also already own the fog formation by evaporation of open water can lead to Klareisbildung on plants near the shore,

Clear ice and aviation

Clear ice, which deposits on the wings and control of airplanes and this " iced " is dangerous for flight operations, as the rudder can be blocked by the ice. Also, by lightning Klareisbildung in the cockpit external view are totally, so that the pilot can not land safely. The flying weight of an aircraft may increase so much by clear ice that even with full engine power no longer can rise. Clear ice, the profile shape of the airfoil change such that a stalling at considerably higher speeds imminent. It differs depending on the severity of the clear icing " light icing " (light clear ice ), " moderate icing " (moderate clear ice ) and " severe icing " (severe clear ice ). For the occurrence of icing come in special aeronautical charts own symbols.