Abstract: The most extensive published guidelines to carrying out studies of tornadoes were written by Johannes Letzmann and Harald Koschmieder, issued in 1937. Forgotten for decades, they are presented here in translation, accompanied ...

Abstract: Nine years of waterspout and funnel observations taken at Nassau, Bahamas, are analyzed, revealing a pattern of activity broadly similar to the behavior in the Key West, Fla., vicinity.

Abstract: During the inter-war years one of the most prominent tornado researchers was Johannes Letzmann of Estonia. His productivity was essentially curtailed by the outbreak of World War II; however, up to that time his prodigious ...