River Forecast Center
|Return Frequency QPE:||QPF:|
7 Day Accumulated Qualitative Precipitation Estimate (QPE)/Forecast (QPF) and Return Frequency
This page displays APRFC's accumulated precipitation estimate for the past 7 days and accumulated precipitation forecast for the next 7 days on the top row. The bottom row displays the associated precipitation return frequency. Mouse-over a button to display the desired image below.
For return frequency, values below 1 represent the ratio of precipitation vs the 1-year return frequency value. Values above 1 indicate the return frequency in years. For example, if the value is 25, then the precipitation amount equals the 25-year return frequency. (i.e. a 1 in 25 year event). If the value is 0.5, then the precipitation amount is half of the 1-year return frequency. Precipitation frequency values were obtained from the NOAA Atlas 14 dataset (https://hdsc.nws.noaa.gov).
US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
Alaska-Pacific River Forecast Center
6930 Sand Lake Road
Anchorage, AK 99502
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