2 year and 100 year Precipitation Return Periods

2-year and 100-year Precipitation Return Periods

NOAA Atlas 2 is a Precipitaiton-Frequency document defining the return period for 2, and 100-year, 6, and 24-hour precipitation return periods

See the Hydrometeorological Design Studies Center web page for detailed information on Precipitation Return Periods in your area.
Click on Maps to get larger more detailed version.

US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
Northwest River Forecast Center (NWRFC)
5241 NE 122nd Avenue
Portland, Oregon 97230-1089
Telephone: 503-326-7401

Last Modified: November 29, 2005

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