Why are weather forecasts wrong?
Weather forecasts are sometimes wrong because weather is so unpredictable. It doesn't always work out the way we think it will. For instance, there could be a 90% chance that it will rain tomorrow, but that also means there's a 10% chance there won't be rain tomorrow. Clouds fade away over time, so a rainstorm is very likely, but it, along with any other weather, can never be 100% guaranteed to happen.