CCTV broadcasts weather forecast every day, and the first broadcast is () A. Urban weather forecast B. Ocean weather forecast C. Satellite cloud picture.

C

The satellite cloud images of China's Central Meteorological Observatory were taken from meteorological satellites such as Fengyun-1. Using satellite cloud photos for analysis can improve the accuracy of weather forecast.

the time limit of weather forecast is usually divided into three types: short-term weather forecast (2-3 days), medium-term weather forecast (4-9 days) and long-term weather forecast (more than 1-15 days). CCTV broadcasts mainly short-term weather forecasts every day.

Extended data

There are several methods for forecasting elements:

1. Empirical forecasting method

Based on the situation forecast of weather map, the future weather distribution is predicted according to the future position and intensity of weather system. For example, when the low pressure moves and is strengthened, it can be predicted that there will be rainy weather or heavy precipitation in the future.

2. Statistical forecast method

Analyze the historical data of weather, seek the correlation between the change of atmospheric state and the previous meteorological factors, and use regression equation and probability principle to screen the forecast factors and establish the forecast equation. So as to obtain the required forecast value. The effect of this method mainly depends on the correct choice of factors.

3. Dynamic statistics

Taking the future meteorological parameters calculated by numerical forecasting method as forecasting factors, a set of forecasting formulas are obtained by regression equation, and the factor forecast is made. With the improvement of numerical model, the accuracy of this method may be steadily improved.

Baidu encyclopedia-weather forecast