In the morning, the clouds blocked the dam and it meant it would rain for three days.

Cloud dams appear in the morning, and rainfall usually occurs within three days. A cloud dam is a weather phenomenon that appears as a narrow band of clouds on a morning weather map across certain areas, with a parallel clear band along its southern edge. Cloud dams are formed due to changes in the wind direction in the southern edge of a high-pressure system when it develops vertically. When the wind blows from the southern edge of the high-pressure system toward the cloud barrier, the cloud band will move northward and updrafts will form within the cloud band, which will cause rainfall. Therefore, if cloud dams appear in the morning, rainfall is likely to occur within three days.