Why does the weather forecast report to Harbin after reporting it to Beijing?

The first one to appear is Beijing, the capital. This is naturally easy to understand. Generally, the weather forecast of provincial stations puts the provincial capital first, and broadcasts it twice before and after. The same is true for each prefecture and city. This is to facilitate those Prepared for viewers who missed the weather forecast for the Beijing area. Then Harbin, Changchun, Shenyang, Tianjin, Hohhot Act 2: Urumqi, Yinchuan, Xining, Lanzhou, Xi'an Act 3: Lhasa, Chengdu, Chongqing, Guiyang, Kunming Act 4: Taiyuan, Shijiazhuang, Jinan, Zhengzhou, Hefei, Nanjing, Shanghai Act 5: Wuhan, Changsha, Nanchang, Hangzhou, Fuzhou, Taipei Act 6: Nanning, Haikou, Guangzhou, Hong Kong, Macao From these regions, it seems that it is not simply Northeast, North China, Northwest, Act 1 of the Southwest Division: Northeast + Beijing, Tianjin, Hohhot Act 2: Northwest Act 3: Southwest Act 4: North China + North-Central East China + Zhengzhou Act 5: Central China + East-Central South Act 6: South China If the regions are divided in this way, it would seem too complicated. So judging from the regional map in the upper right corner of the TV, it seems that they are divided according to longitude and latitude lines. Then: line a is about 109°E, line b is about 34°N, line c is about 39°N, line d is about 31°N, line e is about 23°N (I guessed randomly), this is roughly how it is divided. Divided into six major sections and analyzed from city to city, the broadcasting method from north to south and from east to west is still inherited.