I would suggest that it depends on the hemisphere.
In the Northern Hemisphere the gusts tend to veer, ie increase in value, eg 270/10G20 will likely see the gust to be from greater than 270 (maybe 300).
In the Southern Hemisphere the gusts tend to back, ie increase in value, eg 270/10G20 will likely see the gust to be from less than 270 (maybe 240).