Upper midwest here. Hourly predictions are accurate more often than not, and a few days out is chancey.

Big storms are often exaggerated, though I suspect that's because the risk of flooding, ice and other hazardous travel conditions are serious enough to be overly cautious.

We had predictions for major snowfalls a few times, and every time was completely overblown, and then one hit exactly as predicted. Definitely glad I wasn't on the road that evening.