The phrase "a sort of calm" is correct and usable in written English.
It can be used to describe a feeling or atmosphere that is somewhat calm, but not entirely so, indicating a degree of calmness rather than complete tranquility.
Example: "After the storm passed, there was a sort of calm that settled over the village, as if nature was taking a deep breath."
Alternatives: "a kind of tranquility" or "a type of serenity".
A sort of calm seemed to be returning after the counterterrorism storm — until the Boston attack.
He exudes a sort of calm that most New Yorkers get to experience only with prescription medication.
David Cameron thinks that regional newspapers exhibit "a sort of calm and reasonableness" that is rarely found in national papers.
Even the idea of these routines can offer a sort of calm, especially to those who feel overwhelmed by a life online.
"Seeing Iceage get their music acknowledged has given musicians here a sort of calm confidence," says Nis Bysted, who co-manages Iceage and runs the Copenhagen label Escho.
It is the quality that the journalists may have in mind when they write of Mr. Macmillan as being "Edwardian" showing a sort of calm grand manner left over from an age without tranquilizers.
If Mr Hollande's arrival has spread a sort of calming lotion over France, it may be that the ungrateful French are now starting to feel that being soothed is all very well but not enough to dig them out of a hole.
It has a markedly different cadence from the other books, especially when Aravis tells the story of how she escaped her marriage, and it has a sort of calming repetition to it that Lewis messes with when you're supposed to get worried about something.
Instead Maxwell sold anticipation, delivered with a sort of aquatic calm.
A tall, round-faced man, Kondrat radiated a sort of wry calm, which seemed fitting since, as he explained, he is a Buddhist.
In the eastern city of Dnepropetrovsk, a sort of festive calm reigns, but the fighting seems closer, with collection boxes for ultranationalist far-right militias like the Azov Battalion gracing the entrances of local businesses.
