Knock hard

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Possible Answers:

RAP.

Last seen on: Universal Crossword – Sep 9 2021

Random information on the term “RAP”:

The Rapid Refresh (RR or RAP) is a numerical weather prediction (NWP) model. The model is designed to provide short-range hourly weather forecasts for North America. The Rapid Refresh was officially made operational on 1 May 2012, replacing the rapid update cycle (RUC). The model also serves as the boundary conditions for the higher-resolution High Resolution Rapid Refresh HRRR model, that uses a 3 km (1.9 mi) grid spacing on a domain covering the continental United States.

The Rapid Refresh is run at the NOAA National Centers for Environmental Prediction (NCEP). It is based on the framework of the Weather Research and Forecasting model (WRF); the Global Forecast System (GFS) provides the boundary parameters. The grid points are spaced every 13 kilometres (8.1 mi), with 50 vertical intervals extending up to the 10-hectopascal (10 mb) level of the atmosphere. The model runs once each hour, with forecasts given hourly out to 18 hours.

RAP on Wikipedia