Why is Yibin not in the weather forecast of CCTV 1?

The reason why there is no Yibin city in CCTV 1 weather forecast is that when CCTV's Network Weather Forecast program was launched, the order was: Beijing was the capital, and other provincial capital cities were ranked according to geographical location and climate characteristics, and according to the business division of the State Bureau of Surveying and Mapping and the China Meteorological Bureau, from north to south and from west to east, which was determined and approved by the State Council. On July 7th, 1980, the TV program News Network Weather Forecast was born. Because it was broadcast immediately after CCTV's News Network, it was called News Network Weather Forecast.