Following the Japanese government’s sealing a deal to purchase the Diaoyu (called Senkaku in Japan) Islands from their private Japanese owners, the Chinese government took a series of counteractions to fight for sovereignty over the islands.
On September 11, 2012, China sent two ocean surveillance ships (No.46 and No.49) to the waters around the Diaoyu Islands and claimed to have implemented an action plan in case they need to protect the island’s sovereignty. 
Also on September 11, 2012, the Central Meteorological Observatory started to include the Diaoyu Islands and the surrounding waters in its weather forecast for domestic cities.  At the same time, China Central Television (CCTV) started to air the weather forecast for the Diaoyu Islands following CCTV’s daily news program. 
Sources: People’s Daily, September 11-12, 2012