From Financial Doldrums to Storm

This weekend, again at the lake - the Attersee: Yesterday evening, within twenty minutes the wind changed from doldrums to storm and the water began to swirl.

Half a dozen sailing boats have been surprised and needed to be pulled ashore by the water rescue. To be honest, I completely save held my breath and thought how many financial market participants will find themselves in such situations. No harbinger of things to come.
It is about Riding The Price Waves. Everything is easy if the "water" is smooth. You do not ned to switch the system often, you can apply principle component analysis, surrogate models, .. But, ironically you need massive information, when you are in a turbulence - and you need to switch regimes.