SPX 1 min chart - complete double zig zag:
Its looks nice and impulsive to the downside, so could be the 3rd of a 3rd wave that most of the bearish counts call for. However, the drop from where I have wave 2 could just be part of a 4th wave correction within an impulse up from 1 July - see the chart of Option 3 from last night. The invalidation point for that way of counting the impulse is well below us at 1028.74. So, we can't necessarily assume we've started a major decline at this stage. But its a good start.