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frequency estimates
The NWS-OWP Hydrometeorological Design Studies Center provides precipitation frequency (PF) estimates for various areas of the U.S. as Volumes of NOAA Atlas 14. Estimates in a variety of formats with supplementary information and documentation are available from the PF Data Server (PFDS). Publications for states not covered by Atlas 14 are also available.
Probable maximum 
The National Weather Service (NWS) has provided probable maximum precipitation (PMP) guidance and studies at the request of various federal agencies . Probable maximum precipitation updates are currently not being developed. Legacy NWS PMP documents are available at this link.
Also available on this site: 

- NWS publications of interest for PF and PMP studies (NOAA Atlas 14, NOAA Atlas 2, Technical Reports,
Technical Papers, Hydrometeorological Reports)
- Probability analysis for selected historical storm events
- Record point precipitation for the USA and the world

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