I wanted to add a precipitation layer from the boulder county floods in 2013, to creat a map that retraces the events. how can I do that?
Are you going to use vector or raster data? I think you should look at time enabled layers (Enabling time on your data—Help | ArcGIS for Desktop ) if you want to do time-series maps, which will work for vector and raster (mosaic).
Retrieving data ...