The weakness in yesterday's VIX momentum was a good telltale of today's pop and going forward we'll make a effort to incorporate a VIX based TrendX into the side panel metrics to accompany SPY and XIV and help detect momentum lags like yesterday's.
Keep in mind that XIV is an ETN and trades like a stock (no options), whereas VIX is an index based on SPY put options and only trades as an option so we can expect some discontinuity in the divergent correlation of the two instruments as expiration approaches and implied volatility fluctuates.
