As far as I know, no such metamagic exists, but I have an air-school sylph wizard who loves creative uses of Gust of Wind, Wind Wall, Hurricane Blast, Path of Winds, etc.
However, all these spells seem to have their windspeed locked right between Severe and Windstorm level. As they all say "~50mph, tiny and smaller are blown away and take large damage, small is blown away and takes light damage, medium can't move into the wind and large is unaffected" And as far as I know, no metamagic exists to kick it up any further notches. But my DM likes the idea of having a metamagic do that.
So: First off, am I unaware of a metamagic that would do just that?
If no: What metamagic would best be houseruled into serving this purpose?