Weather is so unpredictable, it is difficult even for expert weathermen to tell you if tomorrow will be a good day for a picnic or a good day for skiing. Today, the weather instruments are a lot better and predicting the weather is a lot more accurate. But, they still miss it a lot of the time.
When a serious weather event is coming, like a hurricane, or a tsunami, they can be predicted.
The weathermen know something about the course of a hurricane or tsunami, so you can try to get out of the area.
Tornadoes can be seen coming, but their path is a lot harder to predict. They twist and turn and change directions so fast, it's hard to get away. I can't imagine being in the path of one of those devils.
Hopefully, weather prediction and weather instruments will improve so we can predict weather better.