Orchestrate a few changes in such a bulletin (7,8)

I believe the answer is:

weather forecast

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'such a bulletin' is the definition.
I can't judge whether this definition defines the answer.

'orchestrate a few changes' is the wordplay.
'changes' indicates anagramming the letters.
'orchestrate'+'a'+'few'='orchestrateafew'
'orchestrateafew' is an anagram of 'WEATHER FORECAST'.

'in' is the link.

Can you help me to learn more?

(Other definitions for weather forecast that I've seen before include "prediction" , "item after news" , "Predicton" , "Met objective" .)

I've seen this clue in The Guardian.

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