Weather map motion. Two-dimensional streamlines based on wind speeds at various levels show areas of convergence and divergence in the wind field, which are helpful in determining the location of features within the wind pattern. A popular type of surface weather map is the surface weather analysis, which plots isobars to depict areas of high pressure and low pressure. Cloud codes are translated into symbols and plotted on these maps along with other meteorological data that are included in synoptic reports sent by professionally trained observers. The use of weather charts in a modern sense began in the middle portion of the
What Makes a Battle What Makes a Battle What Makes a Battle was a propaganda short produced by the US Army Pictoral Service in 1944. It documents the taking of the Marshall Islands while also encouraging increased war production. The film opens with the narrator asking "What makes a battle?" while the camera is focusing on shipments of industrial transports, "This is what it takes to make a battle." This statement sets up the dual nature of the entire film. War supplies are pouring in from every part of the country, from every type of American "Republican and Democrat, white and colored." Industrial production