Rapid Refresh with Chemistry

Real time forecasts predicting weather and air quality

The Rapid Refresh model is used to forecast weather air pollution. The model is based on the Weather Research and Forecasting coupled with chemistry (WRF-Chem). Major components and details of the model include:
For a more detailed description of the meteorology model, one may go to the Rapid Refresh model web page or to the WRF/Chem web page for a description of the chemistry model.

The figure above shows the surface PM 2.5 Aerosol Dry Mass loop from October 17-18, 2020

In addition to the forecasts shown below, the High-Resolution Rapid Refresh with fire smoke (HRRR-Smoke) is being run in real time on a high resolution domain (3km resolution) over the CONUS domain. Output from the forecasts are available under the HRRR-Smoke web page.

The RR-Chem forecasts are run twice a day - 00 and 12 UTC. A few plots from the model forecasts are provided below.

13 km RR-CHEM air quality and weather forecast using RACM-SOA-VBS (modal aerosols)

This model is run on NOAA/ESRL's 64-bit supercomputer. Meteorological initial and boundary conditions come from the GFS model forecasts. For air quality forecasts, the chemistry fields produced by a previous 12 h forecast are used to initiallize each new forecast. Anthropogenic emissions data for CONUS are from an improved EPA NEI-11 (National Emissions Inventory, 2011) data set with RETRO/EDGAR emissions used elsewhere.