I don't really pay close attention to weather forecasts outside of winter snow predictions, so not sure if it's snow specific but I find the snow total forecasts to still be very unreliable, and that's frustrating when trying to plan a trip. Almost 2020 and we can't do better than a 1 to 3 range 24 hours out? That's just sad.
Not blaming the forecasters, I know they work with the tools they have, but those models just suck ass. Until the storm actually hits, there is just no way to know where and how much will dump. Snow-forecast is about a reliable as a cheesecloth condom, opensnow is a bit better but mostly because more conservative so their estimates tend to be less volatile, and they give a wide range, so of course it tends to be less precise than Snow-forecast so less error-prone, but not necessarily more accurate.
Opensnow has local forecasters trying to make sense of it all and give their own daily forecast, which is the best resource available online imo, but still not very reliable, they flip-flop a ton in the 48-72 hours leading up to a storm both regarding amounts and location, which sucks if you want to plan things ahead, gotta be flexible until the last minute if you want the deepest pow.
And from what I hear g5 will somehow mess with our forecasting system so we can expect forecasts to get less and less reliable.