Many agencies use weather balloon flights to model the atmosphere and to make more accurate weather predictions. They collect such atmospheric information as temperature , pressure, and humidity that can then be plotted on weather maps. Three-dimensional atmospheric modeling is also possible using weather balloons because the instruments they carry are able to provide data collected from several different altitude points. Since they started, the long bags of helium have been carrying aloft increasingly sophisticated observation devices. The take the science of weather observation literally to the edges of outer space .