What is the weather sign of light rain?

The weather sign of light rain is a drop of rain under the cloud.

When observing a certain weather phenomenon, meteorological observers should record the corresponding symbols in the "Weather Phenomenon" column of the observation record book of the day, except for a few phenomena, and also record the starting and ending time.

forecast

Use forecasting model to predict future weather. It still needs manpower to choose the best possible prediction model, and it also needs to consider pattern recognition skills, teleconnection, pattern efficiency and pattern deviation.

Chaos of the atmosphere, a lot of computing resources needed to solve equations describing the atmosphere, errors caused by initial measurement and incomplete understanding of atmospheric processes, all these factors make the earlier the forecast, the longer the forecast time (forecast range), the worse the forecast results. Using ensemble forecasting can help us reduce the error and choose the most possible result.

Weather forecasts have different end users. Weather warning is an important forecast for protecting life and property. Forecasting based on temperature and precipitation is very important to agriculture, so it is also valued by commodity traders in stock and futures markets. Public utilities also rely on temperature forecasting to estimate future demand.