Same, but in a human context, are mundane atmospheric events so far off today that error bars would have any practical value and/or potentially introduce confusion?
https://weather.gc.ca/city/pages/on-143_metric_e.html
I really like that discussion type forecast.
Up until that point, error bars increase. At least to me, there's a big difference between "1 mm rain guaranteed" and "90 % chance of no rain but 10 % chance of 10 mm rain" but both have the same average.
The result is that I will be told ~50% chance of precipitation, but the places I care about might well be in the essentially 0% or essentially 100% parts.
The single forecast for a decent size city problem impacts other parts like forecasted highs/low. Even without a front, in some cities that have incorporated much of their suburbs, it is not uncommon for the eastmost part and westmost part to differ by 5-6 degrees, and that is ignoring the inherent temperature differences found in the downtown areas.
I've been seeing this question come up a lot lately. The answer is no, weather forecasting continues to improve. The rate is about 1 day improvement every 10 years so a 5 day forecast today is as good as a 4 day forecast 10 years ago.