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Current Precipitation Frequency Information and Documents for WASHINGTON

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<=1 hour

1 hour - 24 hour

  • NOAA Atlas 2, Volume 9, Precipitation Frequency Atlas of the Western United States, (1973). Generalized maps are presented for 6- and 24-hr point precipitation for the return periods of 2, 5, 10, 25, 50, and 100 years. Equations and interpolation diagrams are provided for determining values for durations less than 24 hours and for intermediate return periods. Area reduction curves for adjusting point values for areas up to 400 square miles are included. This Atlas is published is published in separate volumes for each of the States.

    For access to NOAA Atlas 2 GIS grids and an on-line look-up function, please visit the HDSC NOAA Atlas 2 site.


  • Technical Paper 49, Two-to-Ten-Day Precipitation for Return Periods of 2 to 100 Years in the Contiguous United States (1964)
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