Saint Marcellus' flood kills at least 25,000 people on the shores of the North Sea.

Saint Marcellus's flood or Grote Mandrenke was an intense extratropical cyclone, coinciding with a new moon, which swept across the British Isles, the Netherlands, northern Germany, and Denmark around 16 January 1362, causing at least 25,000 deaths. The storm tide is also called the "Second St. Marcellus flood" because it peaked on 16 January, the feast day of St. Marcellus. A previous "First St. Marcellus flood" had drowned 36,000 people along the coasts of West Friesland and Groningen on 16 January 1219.

January 17 is the 17th day of the year in the Gregorian calendar; 348 days remain until the end of the year.