"Warming Filter" is a carryover from film days, used to remove bluish tint from overcast lighting or high-altitude lighting, or when shooting in open shade. It's not especially useful in the digital world, where Auto White Balance does the work for you. It may help a little when you're on Daylight WB and have areas of open shade, but it warms everything, not just the shade. Some film people use them for portraits in daylight also, to give a warmer cast to the skin.
Robt.
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