The Uragan-class guard ships were built for the Soviet Navy as small patrol and escort ships. Eighteen were built in the 1930s and served during World War II in all four of the Soviet Fleets: Baltic, Black Sea, Northern and Pacific. Four were lost during the war and the rest remained in service until the late 1950s in various secondary roles. The official Soviet designation was Project 2, Project 4 and Project 39, but they were nicknamed the "Bad Weather Flotilla" by Soviet sailors by virtue of their meteorological names.