Rapid Refresh with Chemistry

Real time forecasts predicting weather and air quality

The Rapid Refresh model is used to predict air pollution. The forecast model based on the Weather Research and Forecasting (WRF) coupled with chemistry via the RACM chemical mechanism incuding MOSAIC/VBS for better prediction of secondary orangic aerosols (SOA). In addition, the forecasts 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 combined RAQMS and RAP-Chem ozone fields on the 320 K isentrope at 00 UTC for 5 August 2015 (courtesy Dr. Brad Pierce, NOAA/NESDIS).

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.