In weather forecasts on the radio or on TV, I frequently notice the announcers
suddenly starting to add "でしょう" to almost all their sentences. Now I know this
is used to indicate uncertainty, which seems understandable given that weather
forecasts _are_ uncertain. However, I would say such constructions would be
considered quite unusual in other languages (at least in Western European
languages it is), in which the (majority of) sentences do not imply
uncertainty, at least not explicitly.

Is this a phenomenon occurring only in Japanese? Is it simply by custom, that
is, something someone started doing at some point and simply became the norm?
Or is there some more important (cultural or linguistical?) reason behind
explicitly using "でしょう" in such contexts?
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2018-12-20T21:19:46.870
64516
2018-12-20T21:19:46.870
16165
question
usage
Why is "でしょう" the norm in weather forecasts?