pilviilmiöt

Pilviilmiöt refers to atmospheric phenomena associated with clouds. These can include a wide range of visual spectacles and physical processes occurring within or related to clouds. The most common pilviilmiöt are precipitation events such as rain, snow, sleet, and hail, which form when water droplets or ice crystals within clouds grow large enough to fall to the Earth's surface. Other visible phenomena include various cloud types themselves, like cumulus, stratus, and cirrus, each indicating different atmospheric conditions.

Optical pilviilmiöt are also significant. Rainbows are a classic example, occurring when sunlight refracts and reflects within raindrops. Halos, arcs, and sundogs are other optical effects caused by ice crystals in cirrus clouds interacting with light. Clouds can also produce electrical phenomena, most notably lightning, which is a sudden electrical discharge within a cloud, between clouds, or between a cloud and the ground. Thunder is the sound produced by the rapid expansion of air heated by lightning. Fog and mist are essentially clouds that form at or near ground level. Understanding pilviilmiöt is crucial for meteorology, aviation, and various other fields that rely on weather forecasting and atmospheric science.