> What I don't understand is why the sudden move today? Did the longs think they had a place to put the oil on Friday but found out over the weekend they had no place to put it? Just seems like you would know what to do with the oil on Friday. Note this is not a rhetorical question, I would sincerely like an answer.
Guys like myself, an ex fund manager, could be tourists in the oil market. I know I was, speculating occasionally on oil without knowing a whole lot about the details. Plenty of macro guys are similar, they bet on the large movements as the opportunites present themselves and don't worry about the details.
So what has probably happened is some of these tourists have had a few contracts left over that they forgot about or didn't discover in their position keeping until their prime brokers phoned them, and they had to dump into a market under very special conditions. Hopefully not very many contracts.
In normal times if you screwed up and had to do delivery, it stil wouldn't be a big problem, because the storage is available and you essentially just buy it (by trading with a guy who actually knows how to organize it), costing relatively little.