80% coverage would still be like a cloudy day. Best way to describe a total eclipse (from my own recollection when I was 8)- have you ever seen a nasty thunderstorm suddenly roll in mid-day; and you say to yourself "man, that sure got dark quick!" That is the effect from 85-90%. Then it keeps getting darker, each bit more intense than before. In part because your circadian rhythm says it shouldn't be night yet, and in part because everything else around you gets weird. Birds start freaking out, dogs start barking. Stars start to become visible and then the street lights come back on. Then before you know it, it has gone from cloudy day to full moon night in 3 minutes. You see an amazing fireball in the sky of the sun's atmosphere for a minute or two, then everything returns to normal.
If 50% coverage is a 1/10, 80% is a 3/10 IMHO. However if I was in Calgary, I'd take some time to check it out.
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