Form:
thin fibers or threads, rarely also bundles; edges usually frayed by the high winds.
Description:
consists of ice crystals.
Interpretation:
Fair weather cloud; when compressed it can be a sign for a warm front (precipitation).

Form:
Form: Heap cloud; occurs mostly in more or less expanded fields, which consist of small granular cloud parts, rarely also in small ripped to pieced bundles.
Description:
consists almost exclusively of ice crystals; strongly undercooled water drops will mostly freeze inside the cloud.
Interpretation:
indicate strong vertical movement in the altitude in which they form.

Form:
Layer cloud; occurs either as a fibrous veil in which thin stripe can form, or as a veil-like fog; it can never completely cover the sun. Under certain conditions, these clouds produce a "halo" around the sun, caused by the refraction of the sunlight.
Description:
consists primarily of small ice particles.
Interpretation:
Indicate the arrival of a warm front (with precipitation) within 1 to 2 days.

Form:
Heap cloud; appears mostly as a big field which consists of many small single clouds.
Description:
consists almost exclusively of water droplets; only at low temperatures ice-crystals can appear.
Interpretation:
indicates horizontal aerial current and, in addition, vertical currents at some places in the middle cloud layer.

Form:
Thread medium high layer cloud without contours.
Description:
Composed of to ice-crystals as well as water droplet.s
Interpretation:
Indicator for precipitation within next few hours.

Form:
Layer cloud; appears in spots, fields or layers which aggregate into steadily arranged clods, bales or rolls.
Description:
Consists primarily of water droplets; these are the most frequent clouds; often have grey colouring, because the water droplets absorb a lot of light.

Form:
Misty layer cloud; absolutely without structure.
Description:
Consists of small water droplets; it can generate halos; often originates with high pressure and low air movement.
Interpretation:
Generally indicates a rather quiet weather condition.

Form:
Cumulus are thick heap clouds sharply separated from each other; the edges sometimes look tattered and change constantly.
Description:
Consists almost exclusively of water droplets; only at low temperatures ice-crystals can appear; originate with locally restricted upward wind; for gliders and pilots, cumuli are an indicator for upward winds.
Interpretation:
Nice weather cloud. If the cloud reaches  the medium levels of the atmosphere and is turning into a Cumulonimbus cloud, light showers may arrive.

Form:
Very vast, dark grey layer; strong vertical expansion
Description:
Consists of water droplets and/or ice-crystals; originates from the upward movement of moist air moving within a warm front.
Interpretation:
Long-term rain / snow about several hours or days.

Form:
very big heap cloud with the massive vertical expansion which originates from a Cumuluscloud 
Description:
exists of water droplet and ice-crystals which seem, however, primarily in the upper parts; originates from a big Cumuluswolke which if it owns enough humidity and elevation impulse, spreads out upwards, later the upper one spreads distribute to the cloud horizontally further, Sodas the so-called "anvil" originates
Interpretation:
From Cumulonimbi precipitation falls in the form of rain, hail or snow, often are present also thunderstorm; a full-grown cloud can take up up to 100 million tonnes of water, hence, violent showers and hail can fall, moreover, are to be calculated with Cumulonimbi on violent hoists which can reach a speed from up to 120 km/h. Also within the cloud there is strong turbulence, so that they themselves can become dangerous for big airplanes and should be also therefore flew around.