How to see the satellite cloud picture of weather forecast? How do you know it will rain or clear up?

Meteorological satellite is a geosynchronous satellite, located on the equator, with a fixed height and relatively static with the earth. Geosynchronous satellites detect the temperature of the earth's surface through infrared detectors, and if there are clouds, it is considered as the temperature of the detected clouds. The infrared detector detects along the longitude and latitude lines at a stepping angle and a line scanning angle, and each scanning angle is 140 micro-arc. However, although the scanning step angle and the line scanning angle are unified, the latitude and longitude coordinates corresponding to the earth are not equally divided. It is impossible for a meteorological satellite to detect the temperature of all points on the earth, and the South Pole and the North Pole are also blind spots. Therefore, the one-to-one correspondence between each scanning point and latitude and longitude is generally calculated first, and then the temperature data detected by the infrared detector (the infrared detector will convert the temperature into gray, that is, black and white with different colors) are synthesized and synchronized to the two-dimensional map, which is the satellite cloud image we see. White is generally a low-temperature area, black indicates a high-temperature area, and white places are clouds. Generally speaking, the weather forecast is not judged from a single satellite cloud image, but from the movement change of the cloud (wind vector) at continuous time, that is, a cloud image can not play the role of weather forecast. By image matching, all the same pixels in a certain range corresponding to the gray matrix (for example, all 4X4 pixels in 16X 16) are continuously compared to judge the vector of wind, the magnitude and direction of wind, and the meteorological change is judged by the movement of clouds. This kind of calculation is usually very large, so the meteorological bureau must generally have such a perverted thing as a supercomputer.