Traditional Culture Encyclopedia - Weather forecast - How to judge that it is going to rain?

How to judge that it is going to rain?

1, "Hook cloud is hanging in the sky and rain is dripping on the ground": Hook cloud refers to a cirrus cloud. Behind this cloud, there are often fronts (especially warm fronts), low pressure or low pressure troughs moving, which indicates that rain is coming; 2. "Battery cloud, rain": Battery cloud refers to fort-shaped altocumulus cloud or fort-shaped stratocumulus cloud, which appears in front of the trough with low pressure, indicating that the air is unstable, and thunderstorms usually come every 8- 10 hours. 3. "Clouds pass through clouds, and it rains": Clouds pass through clouds means that the moving directions of the upper and lower clouds are inconsistent, that is to say, the height and wind direction of clouds are inconsistent, which often occurs near the front or low pressure, so it indicates rain, and sometimes the wind direction of clouds is opposite to the ground, so there is a saying that "the sky is going to change". 4. "The river pig crossed the river and it rained cats and dogs": The river pig refers to the broken rain clouds in nimbostratus. The appearance of this cloud indicates that there is enough water vapor in nimbostratus, and a rainstorm is coming. Sometimes broken rain clouds are blown to cloudless places by strong winds, and it is also a precursor to rain to see clouds like river pigs floating across the "Milky Way" at night. 5. "Cotton cloud, rain is coming": Cotton cloud refers to flocculent cumulus clouds. The appearance of such clouds indicates that the middle atmosphere is very unstable. If there is enough water vapor in the air and there is upward movement, cumulonimbus clouds will form and thunderstorms will come. 6. "Gray cloth hangs in the sky, and the rain will continue": Gray cloth cloud refers to nimbostratus, which is mostly formed by the reduction and thickening of high-level clouds, with a large and thick range and sufficient water vapor in the clouds, which often produces continuous precipitation.