My friend Alana brought this to my attention last week - from this
website you can access/download NOAA Atlas 2 precipitation frequency
estimates in GIS compatible formats for a specific site, based on
latidue & longitude. A handy resource when developing IDF curves &
can be used in conjunction with the UD-Rainzone workbook (available at
www.udfcd.org).
http://www.nws.noaa.gov/ohd/hdsc/noaaatlas2.htm