Paul-
I had a similar experience. Never had to work so hard going downhill. Turned the corner and hit the crosswinds. I knew it was the wind but I instinctively kept checking my rear tire thinking I had flatted, since the bike was getting pushed back and forth so much. When I finally got to ride the tailwind, I lucked out with the traffic lights and was able to really fly, which is good, because I ride fixed and even with a front brake it would have been hard to come to a sudden stop with such a strong blow pushing me along.
Looks like we are in for the same, tomorrow. As long as there's no rain, it's fine with me.