Wake vortices on approach to JFK
I was travelling on a Jet Blue A320 on a calm evening last week when at around 18,000ft out of nowhere we hit severe turbulence for around 15 seconds. The aircraft vibrated, dipped slightly and lurched to the right. Then - all was calm.
A short time later, the captain came on to say that we had gone over the wake of a following aircraft.
This is only the second time I have experienced this - although this time is was at a much lower altitude.
I have heard how dangerous wakes can be - are they "less" dangerous if you are at a higher altidude?
Also, what is the means for escape? Do you simply keep flying on and hope you pass through it, or is there a proper procedure?