Unnamed Subtropical Depression (2015)

'''I'm currently stuck in a giant cyclone believed to be extratropical. It's brought inches of rain, and it's not going away until Sunday. However, this storm seems sort of tropical to me, so I decided to make a subtropical depression to represent this unusual "nor'wester" that's impacting the Southeast US this weekend.'''

Post-season analysis revealed that a low originally believed to be non-tropical actually was a subtropical depression.