Answer:
As weather forecasts are based on various assumptions and as the atmosphere is likely to undergo different changes it is possible that these forecasts can be wrong.
Step-by-step explanation:
Weather foretelling is a challenging work. As there are continuous changes happening in the atmosphere it is very tough to predict something about the weather.
A minimal change in the atmospheric condition can leads to many consequences. So, it is quite unpredictable at times. Another reason is that these predictions are based on assumptions, which h can definitely be wrong at certain times.