The National Weather Service Precipitation Analysis Web service combines information from radar and rain gauges to produce maps of estimated rainfall totals. Checkboxes below the map allow you to tailor your view and to choose time periods back to 2005. Maps can show actual precipitation totals, normal, departure from normal, and percent of normal precipitation. They can show either the continental U.S. and Puerto Rico or one state at a time for different time periods back to 2005. Layers, such as topography, population, counties, rivers, states, and highways can be turned off and on. Users can download precipitation data and shape files. There are also useful links to weather forecasts, drought and snow information. The precipitation pages are updated every day, around 9:30 a.m., 12:30 p.m. and 4:30 p.m. Eastern Standard Time.