Isohyet Map

http://www.assessment.ucar.edu/index.html

Above is an example of an Isohyet map, this map type uses lines to convey rainfall in an area. The concentration of lines on the map shows the area that is forecasted to receive the most rain for the longest duration of time.  Moving outwards from the concentration, over Drake, the surrounding areas will receive less amounts of rain as shown by the map. This map is showing the weather to be expected over Colorado State University, in Fort Collins, Colorado.