http://www.fas.usda.gov/pecad/weather/us.html
Also called an Isohyetal line map, these maps show the amount of precipitation. As the scale shows, the colors vary with the amount of rain likely to be produced. The lines are connected and demonstrate inches of rain, in this map, the brown areas demonstrate areas that are unlikely to rain. The map was representative of the probability of the average amount of rain for the whole week so if the viewer of this map wanted information on the likelihood of rain on a certain day before leaving the house, this would not be the best map to view.
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