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High-Resolution Ensemble Forecast

The NCEP High-Resolution Window Forecast System (HIRESW) consists of daily runs of the NCEP Non-Hydrostatic Multiscale Model on B-grid (NEMS-NMMB) and two NCAR Advanced Research WRF (WRF-ARW) runs at ~3 km resolution. Currently, five domains are being run, two large domains (CONUS, Alaska) and three small domains (Hawaii, Puerto Rico, and Guam). The second ARW run (ARW2) is not run over Guam. The source of each run's initial (IC) and boundary conditions (BC) follows:

  1. Alaska NMMB/ARW1 : IC/BC from 6-h old GFS
  2. Alaska ARW2 : IC from current NAM, BC from 6-h old NAM
  3. CONUS NMMB/ARW1 : IC from current RAP, BC from 6-h old GFS
  4. CONUS ARW2 ; IC from current NAM, BC from 6-h old NAM
  5. Hawaii NMMB/ARW1: IC/BC from 6-h old GFS
  6. Hawaii ARW2 : IC from current NAM, BC from 6-h old NAM
  7. Puerto Rico NMMB/ARW1: IC from current RAP, BC from 6-h old GFS
  8. Puerto Rico ARW2: IC from current NAM, BC from 6-h old NAM
  9. Guam NMMB/ARW1 : IC/BC from 6-h old GFS

These are the forecast initial times at which the respective HIRESW domains are run:

- 0000 and 1200 UTC : CONUS, Hawaii, Guam

- 0600 and 1800 UTC : Alaska, Puerto Rico

For EMC-generated HIRESW graphics for the latest run go to the EMC HIRESW web site

The NCEP High-resolution Ensemble Forecast system (HREF) aggregates existing deterministic convection-allowing forecasts to create ensemble products. HREF uses current and time-lagged forecasts from the HiresWindow run (ARW/NMMB over CONUS, Alaska, Hawaii, Puerto Rico). For the CONUS domain, the NAM 3 km nest is also used. HREF is considered as a precursor to a true high-resolution ensemble forecast system to be developed using the FV3 model.

The latest graphics generated by EMC for the CONUS, Alaska, Hawaii, and Puerto Rico are accessible at the HREF home page.

For more info on the HREF and the HiresW, please contact Matthew Pyle

Disclaimer

Please note : The EMC-generated web pages listed above are created on the NCEP development computer, and therefore will not be updated when this computer is down or unavailable. For official NCEP forecast/analysis graphics with 24/7 support, please use the operational NCEP Model Analysis and Guidance (MAG) web site