Scheduled Downtime
On Friday 21 April 2023 @ 5pm MT, this website will be down for maintenance and expected to return online the morning of 24 April 2023 at the latest

Can observational nudging be used for real-time forecasting?


New member
Hello everyone,
Can observational nudging be used for real-time forecasting?
So far, it does indeed improve nicely my forecasts with respect to the measurements, but my simulations are for in the past, with the observational data ingested being already available. I am using GFS forecasting data.
Now I am running simulations with obs_idynin for dynamic initialization, to turn on the ramping down function that switches off the nudging before the actual forecast (from the WRF v4.4 User Guide Chapter 5, page 108). But when I do that, the simulation with nudging starts to coincide with the simulation without nudging very soon after the ramping down is finished.
So how does a typical real-time forecasting system with nudging look like (just as a stream of thought), given that the observations are accessible live?
Thank you in advance!
Last edited:
No, observational nudging cannot be used for real-time forecasting because "future observations" are not available at the time when you run for real-time forecast.