Rainfall totals network?

Anyone know of a webpage that tracks weekly/monthly rainfall using all the primary & co-op (or gage) stations?

I think we're getting a rather localized drought here and would like to examine it at the county level. There has been a distinct pattern of storms south of ACT-LFK and north of DAL-OCH but very little in between and it would be interesting to quantify it. I really have no idea where to look for these maps (or data).