Qualitative Precip Estimate (QPE) / Qualitative Precip Forecast (QPF)/Return Frequency
This page displays APRFC's 24-hr precipitation estimate for the past 7 days (Day -7 to Yesterday) and the 24-hr precipitation forecast for the next 7 days (Today to Day 7) on the top row. The bottom row displays the associated precipitation return frequency for that day. The loop animates the forecasted 6-hr 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).