Rapid Refresh (RAP) and High-Resolution Rapid Refresh (HRRR) Forum

Re: forecasts - instantaneous or averaged

Posted By: Stan Benjamin
Date: 2-July-14 1424Z

In Response To: forecast interpretation (Yura)

Hello, the RAP values, as for any NOAA NWP model, are usually instantaneous values valid at the top of the hour unless specified otherwise (e.g., accumulated precip or snow, time-averaged or time-maximum fields now output from the 3km HRRR). Stan B. Question: I have troubles interpreting the output of the RAP model. Its description explains that it rolls out an hourly-based forecasts for 18 hours ahead of the actual time. Are these forecasts averaged over the course of each hour or represent the forecast for the top of each hour only? In other words, the forecast for the next 18 hours should be interpreted as a step-wise function or a discrete pointer at the top of each hour

Messages In This Thread

forecast interpretation -- Yura -- 24-June-14 2143Z

ADMIN! Re: forecasts - instantaneous or averaged -- Stan Benjamin -- 2-July-14 1424Z

Rapid Refresh (RAP) and High-Resolution Rapid Refresh (HRRR) Forum is maintained by RR/RAP Forum Administrators with WebBBS 5.12.