English grammar problems

This passage must be a weather forecast, which is wrong according to the grammatical requirements. As you said, there is no predicate. But this passage is actually omitted. It must be a guess about the weather on a certain day or time. If this passage is the weather forecast for tonight and tomorrow, then this passage must be preceded by a sentence "Weather forecast for tonight and tomorrow:". The weather forecast for tonight and tomorrow is. "Yong ..." followed by gerund form. This kind of English is casual. For the sake of simplicity, it can probably be found in these news reports or weather forecasts. It rarely appears in formal writing.