I was fortunate enough to have been building a position for some time and that was a nice little surprise!
I cannot be specific on the time because when I saw the 10 pips widened spread, I did not realize it had something to do with the price move and I looked elsewhere. I cannot be sure whether the price already started to move at that very moment. Later on when I saw the big spike, the spreads already went back to 1~2 pips. I hope someone here can share what he saw around that time too. It would be helpful to have this kind of info for price move alert. Next time I will jot it down when I see it and let you know.