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It is high time we took advantage of the information given by the authorities concerned so that we can take precautions against typhoons in advance.

Hi,
Does the above sound good?
Besides, should I use authorities or authority? Thanks.
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It is high time we took advantage of the information supplied by the authorities/authority concerned so that we can take precautions against typhoons in advance.

It depends on whether there is only one authoritative body-- if so, you can use either.
Comments  
have discussed the above with many, but no one has been able to give a satisfactory answer. However, I have found people using 'concerned authorities' 'concerned people',' concerned staff' etc. quite often and with no qualms.

My impression is that 'concerned' should come after the noun to make the desired sense, as the other way round, the word acts as an adjective and gives an entirely different meaning.

Does it sound okay for you? Plz share your view.