‘‘(10) A description of non-Federal precipitation 
data, its accessibility by the Federal Government, and 
ways for National Oceanic and Atmospheric Admin-
istration to improve or expand such datasets. 
‘‘(11) Such other topics as the Administrator or 
National Academies consider appropriate. 
‘‘(c) AUTHORIZATION OF APPROPRIATIONS.—There is 
authorized $1,500,000 to the National Oceanic and Atmos-
pheric Administration to carry out this study. 
‘‘SEC. 602. IMPROVING PRECIPITATION FREQUENCY ESTI-
MATES. 
‘‘(a) IN GENERAL.—The Administrator shall— 
‘‘(1) not later than 5 years after the date of en-
actment of this title and not less frequently than every 
5 years thereafter, update precipitation frequency es-
timates for the United States, such that each update 
includes at least one precipitation frequency atlas 
that incorporates assumptions of non-stationarity; 
‘‘(2) develop products targeted at users of this 
data in support of the mission of the National Oce-
anic and Atmospheric Administration; 
‘‘(3) make publicly available, in a searchable, 
interoperable format, all precipitation frequency esti-
mate studies developed by the National Oceanic and 
Atmospheric Administration that the Administrator 
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has the legal right to redistribute and that are deemed 
to be at an appropriate stage of development on an 
internet website of the National Oceanic and Atmos-
pheric Administration; and 
‘‘(4) ensure all precipitation frequency estimate 
data, products, and supporting documentation and 
metadata are preserved, curated, and served by the 
National Oceanic and Atmospheric Administration, 
as appropriate. 
‘‘(b) AUTHORIZATION
OF APPROPRIATIONS.—There 
are authorized to be appropriated to the National Oceanic 
and Atmospheric Administration to carry out this section 
$3,500,000 for each of fiscal years 2022 through 2030. 
‘‘SEC. 603. IMPROVING PROBABLE MAXIMUM PRECIPITA-
TION ESTIMATES. 
‘‘(a) IN GENERAL.—Not later than 90 days after the 
date on which the National Academies makes public the re-
port under section 601, the Administrator, in consideration 
of the report recommendations, shall consult with relevant 
partners, including users of the data, on the development 
of a plan to— 
‘‘(1) not later than 6 years after the completion 
of the National Academies report under section 601 
and not less than every 10 years thereafter, update 
probable maximum precipitation estimates for the 
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United States, such that each update includes esti-
mates 
that 
incorporate 
assumptions 
of 
non- 
stationarity; 
‘‘(2) coordinate with partners to conduct re-
search in the field of extreme precipitation esti-
mation, in accordance with the research needs identi-
fied by the National Academies report under section 
601; 
‘‘(3) make publicly available, in a searchable, 
interoperable format, all probable maximum precipi-
tation studies developed by the National Oceanic and 
Atmospheric Administration that the Administrator 
has the legal right to redistribute and deemed to be 
at an appropriate state of development on an internet 
website of the National Oceanic and Atmospheric Ad-
ministration; and 
‘‘(4) ensure all probable maximum precipitation 
estimate data, products, and supporting documenta-
tion and metadata developed by the National Oceanic 
and Atmospheric Administration are preserved, 
curated, and served by the National Oceanic and At-
mospheric Administration, as appropriate. 
‘‘(b) NATIONAL GUIDANCE DOCUMENT FOR THE DE-
VELOPMENT OF PROBABLE MAXIMUM PRECIPITATION ESTI-
MATES.—The Administrator, in collaboration with Federal 
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agencies, State, territorial, tribal and local governments, 
academia and other partners the Administrator deems ap-
propriate, shall develop a National Guidance Document 
that— 
‘‘(1) provides best practices that can be followed 
by Federal and State regulatory agencies, private me-
teorological consultants, and other users that perform 
probable maximum precipitation studies; 
‘‘(2) considers the recommendations provided in 
the National Academies study in section 601; 
‘‘(3) facilitates review of probable maximum pre-
cipitation studies by regulatory agencies; 
‘‘(4) provides confidence in regional and site-spe-
cific probable maximum precipitation estimates; and 
‘‘(5) includes such other topics as the Adminis-
trator deems appropriate. 
‘‘(c) PUBLICATION.—Not later than 2 years after the 
date on which the National Academies makes public the re-
port under section 601, the Administrator shall make pub-
licly available the National Guidance Document under sub-
section (b) on an internet website of the National Oceanic 
and Atmospheric Administration. 
‘‘(d) UPDATES.—The Administrator shall update the 
National Guidance Document not less than once every 10 
years after the publication of the National Guidance Docu-
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ment under subsection (c) and publish such updates in ac-
cordance with such subsection. 
‘‘(e) AUTHORIZATION OF APPROPRIATIONS.—There are 
authorized to be appropriated to the National Oceanic and 
Atmospheric Administration to carry out this section: 
‘‘(1) $13,000,000 for fiscal year 2022. 
‘‘(2) $14,000,000 for fiscal year 2023. 
‘‘(3) $14,000,000 for fiscal year 2024. 
‘‘(4) $2,000,000 for fiscal year 2025. 
‘‘(5) $2,000,000 for fiscal year 2026. 
‘‘(6) $2,000,000 for fiscal year 2027. 
‘‘SEC. 604. DEFINITIONS. 
‘‘ In this title: 
‘‘(1) 
ADMINISTRATOR.—The 
term 
‘Adminis-
trator’ means the Under Secretary of Commerce for 
Oceans and Atmosphere and Administrator of the Na-
tional Oceanic and Atmospheric Administration. 
‘‘(2) NATIONAL ACADEMIES.—The term ‘National 
Academies’ 
means 
the 
National 
Academies 
of 
Sciences, Engineering, and Medicine. 
‘‘(3) PRECIPITATION
FREQUENCY
ATLAS.—The 
term ‘precipitation frequency atlas’ means a geo-
graphical atlas, such as the NOAA Atlas 14, that con-
tains precipitation frequency estimates for the United 
States with associated lower and upper bounds of a 
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