text: The weather report doesn't tell you it is going to rain or snow, only that there is a likelyhood of that happening based on prior experience.  If you were going to role a die and someone told you there was a 50% chance of getting an even number, it doesn't make him wrong if you get an odd one.  Even if you get three odds in a row, he is still correct, it just didn't help you very much.  That is the limitation of a weather forecast.  It never says "it is going to rain", but that "rain is likely."