"The sky is fish-scale, and it is windy even without rain." The sky is obviously covered with cirrus clouds (fish-scale shape) and extends for a long time, and this kind of cirrus clouds located at high altitude indicates that there is low pressure. Clouds and fog move from west to east. This will typically increase wind speeds, create squally storms in the east, thicken clouds and produce precipitation over the next 24 hours.

"There are castle clouds in the sky and thunderstorms on the ground."

The cauliflower shape of cumulus clouds in the summer indicates that moisture is rising rapidly and cooling, while dry air continues to sit high in the sky. When castle clouds appear, it indicates that instability occurs when warm, moist air and cold, dry air meet at high altitudes. Castle clouds often produce thundershowers during the day.

"After the rain, the east wind will be strong, and the rain will continue to fall in the next day." "The east wind will not be more than noon, and after noon, there will be a buzzing sound." The reason why the rain comes before the wind is because the front is approaching, so the unstable weather will continue for a while. Two days. The wind comes before the rain because of downdrafts generated by regional storms, so heavy rain may fall again within a few hours.

It rains in the sun's halo at midnight, and it winds in the moon's halo at noon. "

The sun or moon is surrounded by a halo because the ice crystals high in the earth reflect its light. The high concentration of moisture caused by the melting of the ice crystals will sink downwards and form clouds and rain, so it can be Accurately predict the weather.

"There is thunder and rain falls. "

This adage is true in the summer but may not be true in the winter. Air with heavy moisture conducts sound more efficiently than dry air, so sound can be carried to farther areas. In In winter, temperature becomes the main factor. If the air is warm and moist, this adage applies; but if it is extremely cold, the air is denser, so it also conducts sound better than warm air, and the air is also It is drier, but has a relatively slight impact on sound transmission. Therefore, even if the sound travels far in the air, it still reflects the cold and dry weather, rather than predicting rain.