Check the Thai government's official disaster management agency website and local news from Thai media outlets like Thai PBS or Nation Thailand - they'll have the most current situation updates since this is actively developing. Your country's embassy in Thailand should also have travel advisories and advice for citizens, which gets updated pretty regularly when stuff like this happens.
For practical help if you're stuck there or know people who are: make sure anyone sheltering in emergency centres has copies of ID documents stored separately (phone photos work) and knows how to access their bank accounts without needing physical cards. Flooding often knocks out ATMs and card readers, so having digital access to money matters way more than you'd think. Also, if someone needs to stay put, knowing which routes in and out are passable beats being stranded - local taxi drivers and delivery apps usually have real-time intel on what streets are actually navigable, even when official reports lag behind.