The phrase "a warm atmosphere" is correct and usable in written English. You can use the phrase to describe a pleasant social setting, usually one that is filled with positive feelings. For example, "The dinner was a success, thanks to the warm atmosphere created by our hosts."
Exposed brick walls and wood floors create a warm atmosphere.
"It was a beautiful experience, small classes, a warm atmosphere.
One is TUTL, a wonderful little record shop with a warm atmosphere.
Barbara Wallace '80 in her office, which she has specially designed to create a warm atmosphere for mentoring students.
"But then when you are in the chapel," Sister Brigitte added, "there is a warm atmosphere that helps you get inside yourself, whether you are Christian or not".
Here, the glowing light filtering through the stained glass creates a warm atmosphere, suggesting what both travelers attempted to convey in words, sketches and watercolor.
Likewise, a well-understood physical law suggests that a warming atmosphere should hold more moisture.
This is that a warming atmosphere will melt ice at the poles.
The basic scientific reason is simple: a warming atmosphere holds more moisture.
And it has many victims: a warming atmosphere, sullied soils and water, and fragile societies.
In general, a warmer atmosphere causes more water to evaporate from the earth's surface.
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