This image of a rare subtropical storm in the Pacific Ocean was acquired by the MODIS on the Terra satellite on November 1, 2006. Located 900 miles off the coast of Oregon in the northwestern Pacific, this storm system looks like a hurricane, but it is located far from any of the typical hurricane formation areas.
The storm originally formed from a cold-cored extratropical storm, but after spending two days over unusually warm water, it developed a warm center, and hurricane characteristics, such as a cloud-free eye and an eyewall of thunderstorms.
Credit: Jeff Schmaltz, MODIS Land Rapid Response Team, NASA GSFC. Click to enlarge image (1mb)
Unusual weather ? Or not. If it were possible to travel back in time,( before weather patterns were recorded) I think weather patterns like this did occur.