I'm aware that it would likely take some time to bring vast diesel engines online in a tanker, but would the usual procedure in a storm be to have them on to power pumps or to ride up to the anchor if things got squirrelly?
I'm asking because I don't know. For me, having a warm engine idling at anchor would be an easy decision once it got past 30 knots no matter how well I was anchored, because I can neither count on others not coming loose, or simple failure of my rode or the rodes of others, or I might need to "pluck and run" or simply to zoom forward to avoid debris.
I can't imagine that an exponentially larger vessel with cargo aboard and more windage, in conditions that tugs wouldn't be able to maneuver easily, might keep the motors fired up just in case they needed to get underway, or simply to reduce the strain on the main anchor by motoring at low speed toward it.
Am I wrong here? I'm not trying to second-guess the tanker skipper, but I don't know under what circumstances of "storm anchoring" you wouldn't consider being one command away from having a moving prop.