Some background reports on the issue.
Tailwind gusts might not be a significant performance issue, but for aircraft handling there could be a few surprises.
Airbus now includes gusts; a point to note and heed their approach to safety.
http://www.nlr-atsi.nl/downloads/saf...operations.pdf
http://www.nlr-atsi.nl/downloads/saf...s-in-cross.pdf
http://www.nlr-atsi.nl/downloads/ana...ssues-rega.pdf