The phrase "a combination of warm" is not correct as it is incomplete and lacks context.
It could be used in contexts where you are describing a mixture or blend that includes warmth, but it needs to be followed by a noun to be complete.
Example: "The dish was a combination of warm spices and fresh herbs that created a delightful flavor."
Alternatives: "a blend of warm" or "a mixture of warm".
He was ill, his marriage had broken down and his two children were very young, but he succeeded with a combination of warm ingenuity and icy determination.
A combination of warm weather and good conservation techniques has led to what could end up being a record lobster harvest across Maine waters.
This study is concerned with the performance modeling of a fault tolerant system consisting of operating units supported by a combination of warm and cold spares.
Lighting was supplied by a combination of warm and cold fluorescent tubes giving a luminance range of between 2200 and 2800 Lux.
The results suggest that a combination of warm and dry conditions followed by a rapid rise in sea level led to the growth and subsequent drowning of the ancient forest landscape.
Sustainable development policies currently in effect in civil engineering serve to promote techniques capable of saving both energy and raw materials; such techniques use a combination of warm mix asphalt (WMA) concretes with reclaimed asphalt pavement (RAP).
Trewin said the record hot spell was caused by a combination of warmer than normal ocean breezes, few major southerly winds and a lack of easterly troughs that tend to bring rain and cool temperatures.
Larsen B is believed to have been stable until the 1950's when a combination of warming air and ocean water began to erode it.
In other cases, local extinctions have been explained by a combination of warming and drought as seen in the extinction of cool- and moist-adapted small mammal species in the North American Great Basin during the Middle Holocene [9].
Over the last 160 years, April temperatures at the nearby Blue Hill Meteorological Observatory have warmed by around five degrees, because of a combination of global warming and warming associated with the expansion of paved surfaces and buildings in metropolitan Boston.
The relatively strong November sales — caveats and all — were a stark turnaround from earlier in the fall, when a combination of unseasonably warm weather, a tight credit market and high energy prices produced the weakest retail sales in a decade.
