A precipitation curtain that reaches to ground, often seen under storm clouds. Often, especially with heavy-precipitation curtains bringing light precipitation particles to earth (snow and drizzle), the fallstreaks are curved outward, showing the actual flow of the cold downdraft of air spreading out along the surface. Heavy particles like hail and large raindrops are not influenced much by the downdraft-flow of air, and then the fallstreaks are more straight down. Light-colored fallstreaks are usually an indication of hail, whereas darker fallstreaks contain raindrops.
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