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Regions covered by different NWS PMP documents (as of 2012).

Current NWS Probable Maximum Precipitation (PMP) Documents

NOAA’s National Weather Service has provided PMP guidance and studies since the late 1940s at the request of various federal agencies and with funding provided by those agencies. In recent years that funding has diminished and gradually ceased. As a result we are unable to continue our PMP activities. However, we will continue to provide copies of related documents on this site. We recognize that many of the current documents need updating. The Federal Advisory Committee on Water Information’s Subcommittee on Hydrology is examining this issue.

Viewing the documents requires the Adobe Acrobat Reader (click here to download).
Viewing the shapefiles for HMR 58 and HMR 59 requires a Geographic Information Syatem (GIS).


Document link Title Date Size
(MB)
Hydrometeorological Report No. 39 Probable Maximum Precipitation in the Hawaiian Islands 1963 3.4
Hydrometeorological Report No. 41 Probable Maximum and TVA Precipitation over the Tennessee River Basin above Chattanooga 1965 5.7
Hydrometeorological Report No. 46 Probable Maximum Precipitation, Mekong River Basin 1970 16.2
Hydrometeorological Report No. 48 Probable Maximum Precipitation and Snowmelt Criteria For Red River of the North Above Pembina, and Souris River Above Minot, North Dakota 1973 1.6
Hydrometeorological Report No. 49 Probable Maximum Precipitation Estimates, Colorado River and Great Basin Drainages 1977 6.2
Hydrometeorological Report No. 51
Probable Maximum Precipitation Estimates, United States East of the 105th Meridian
Digitized maps
1978 3.5
Hydrometeorological Report No. 52 Application of Probable Maximum Precipitation Estimates - United States East of the 105th Meridian 1982 7.8
Hydrometeorological Report No. 53 Seasonal Variation of 10-Square-Mile Probable Maximum Precipitation Estimates, United States East of the 105th Meridian 1980 3.3
Hydrometeorological Report No. 54 Probable Maximum Precipitation and Snowmelt Criteria for Southeast Alaska 1983 4.6
Hydrometeorological Report No. 55A
Probable Maximum Precipitation Estimates - United States Between the Continental Divide and the 103rd Meridian 1988 103.5
Hydrometeorological Report No. 56 Probable Maximum and TVA Precipitation Estimates With Areal Distribution for Tennessee River Drainages Less Than 3,000 Mi2 in Area 1986 8.5
Hydrometeorological Report No. 57
Probable Maximum Precipitation - Pacific Northwest States. Columbia River (including portions of Canada), Snake River and Pacific Coastal Drainages 1994 28.3
Hydrometeorological Report No. 58
Probable Maximum Precipitation for California - Calculation Procedures 1998 10.9
Hydrometeorological Report No. 59
Probable Maximum Precipitation for California
HMR58 and HMR59 shapefiles (2.9 MB)
1999 21.4
NOAA Technical Memorandum NWS HYDRO 39 Probable Maximum Precipitation for the Upper Deerfield River Drainage Massachusetts/Vermont 1984 1.9
NOAA Technical Memorandum NWS HYDRO 41 Probable Maximum Precipitation Estimates for the Drainage Above Dewey Dam, Johns Creek , Kentucky 1985 1.4
Technical Paper No. 42 Generalized Estimates of Probable Maximum Precipitation and Rainfall-Frequency Data for Puerto Rico and Virgin Islands 1961 4.2
Technical Paper No. 47 Probable Maximum Precipitation and Rainfall-Frequency Data for Alaska 1963 3.1

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