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When we start saying mashiv haruach there is an important requirement of announcing the liturgical change. If one does not hear the announcement, one does not say mashiv until the community would have heard it (this presents the relevant halachos). Also according to the linked Mishna Berura, if one makes a mistake, one does not repeat.

But when we change to vtein Tal, there is no such mention in halacha of a public declaration even though the obligation is seemingly stronger (in that one who misses it DOES repeat - here, second paragraph). I am not sure if my question is why there is an announcement at mashiv haru'ach or why there is none by vtein tal, but it probably includes "why are the two treated differently in terms of public announcement?"

This question, though I came up with it this morning, is strikingly similar to this older, unanswered, and better worded question.

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Why do you say there's no announcement? There is in my synagogue. – msh210 Dec 8 '13 at 7:40
There is no halachic obligation for there to be an announcement nor is there any requirement for there to have been an announcement before anyone's liturgy can change. – Danno Dec 8 '13 at 12:36
See what you think of my edit. – msh210 Dec 8 '13 at 17:01

Here Rabbi Shimon Silver answers:

Since there is no musaf with its mention, the announcement and maximum public notice is not possible anyhow. Therefore, it reverts to its rightful place.

Once we are doing it by Ma'ariv, Ma'ariv is not an appropriate time for announcements at all, for the same reason that Mashiv HaRuach is not announced at Ma'ariv.

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What does he mean by "its rightful place"? – Double AA Dec 9 '13 at 16:16
@DoubleAA, in Ma'ariv, as Mashiv HaRuach should have been in theory. – Yishai Dec 9 '13 at 16:17
But why isn't there a public announcement requirement at Maariv? – Double AA Dec 9 '13 at 16:19
@DoubleAA, there is no such thing as a public announcement at Ma'ariv of this nature, as Ma'ariv is not well attended, may not be a complete obligation, etc. – Yishai Dec 9 '13 at 16:25
Then AFAICT that is your answer, not what you put in the post. – Double AA Dec 9 '13 at 16:36

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