Predictably means ‘in a way you could already see coming.’ It often sits at the front of a sentence: ‘Predictably, the cheapest one broke.’ It tells you what happened, and it adds that this is no surprise. That extra feeling can be calm (‘as expected’) or a bit dry and tired, as if you are not impressed. News writers and teachers like it; in loose chat people more often say of course or as usual. It is the adverb twin of predictable, not a word about tools that forecast the future.