Haven't had a drop yet and don't expect any. That's the norm with weather presentations. Most are wrong, but display differently. And once it does actually start raining its likely to predict rain every day for 'life'.
Looks like the 80% is a big thing in their cogitator and gives 'wiggle room' for vague forecasts. We see it on dry days, almost dry days , mostly damp days and really damp days. It's one calculation I tend to ignore. It's like trying to consistently differentiate between 'partly cloudy' & 'partly sunny'. And it's never 'partly mooney' at night.