A hurricane-like storm has formed off the coast of France according to Jeff Masters. The storm has a symmetric spiral shape with a cloud-free center, like a tropical storm. However, it is not a true hurricane as its energy is not entirely driven by evaporation, the surface waters being too cool. Published research, however, does indicate that true tropical storms may eventually form in the Mediterranean.
While neither the Mediterranean storm nor the Alaskan storm currently whirling is without precedent, both are rare events. Have two such deep extratropical lows ever existed at the same time?