Storms right around the freezing point, where it can vary the snowfall and rainfall amounts dramatically are notoriously hard to predict. Miss by a few tenths of a degree, and the result is completely different.
I tend to ignore most commercial weather sources, and rely more on the National Weather Service (who don't get me wrong is not perfect either). I also actually read their forecast discussion - that's where they lay out how they got to the forecast and often describe how much uncertainty there is in it - and there are times where their different models all say different things, and they have to pick one... There are a lot of times that the forecast is their best guess - but they are uncertain and can lay out what may happen if their wrong.
I tend to ignore most commercial weather sources, and rely more on the National Weather Service (who don't get me wrong is not perfect either). I also actually read their forecast discussion - that's where they lay out how they got to the forecast and often describe how much uncertainty there is in it - and there are times where their different models all say different things, and they have to pick one... There are a lot of times that the forecast is their best guess - but they are uncertain and can lay out what may happen if their wrong.