Then without warning the tempest broke. With a rapidity which, at the time, seemed incredible, and even afterwards is impossible to realize, the whole aspect of nature at once became convulsed. The waves rose in growing fury, each overtopping its fellow, till in a very few minutes the lately glassy sea was like a roaring and devouring monster. White-crested waves beat madly on the level sands and rushed up the shelving cliffs; others broke over the piers, and with their spume swept the lanterns of the lighthouses which rise from the end of either pier of Whitby Harbour. The wind roared like thunder, and blew with such force that it was with difficulty that even strong men kept their feet, or clung with grim clasp to the iron stanchions.