As mentioned the bomb cyclone in PNW this year, but also the hurricane that started in the Pacific, whittled down to a trop depression in the gulf (crossing all that land inbetween!) and then spun up into a gnarly hurricane that made a beeline for florida (iirc?). I distinctly remember a lack of worry about that storm system until it started spinning and collecting more stuff a few days after it had left land in central america. None of the models that i know of correctly predicted that it would re-spin, and even the latest updated models with planes flying in the storm still couldn't nail the eyepath - it was essentially off by two whole cities up until it actually made landfall, and then they were a lot more accurate about the land track.

i'd never heard of a storm doing that, but i am not really that in to weather, so it's possible it's in the training data somewhere?