SOME CAUSES OF UNITED STATES DROUGHT.

Abstract

Some physical causes of United States drought are outlined. Among the associated factors is subsidence, either in the upper level as or to the south of strong jets, or sometimes under prevailing northerly components of upper level flow. These conditions are engendered by abnormal forms of the atmosphere's general circulation. Causative factors vary in kind and degree according to area, so that droughts over the Far West differ from those of the Great Plains or the East. Examples of each of these are shown as well as treatment of a rapidly developing drought.