Page Updated: 04/28/2011
The National Centers for Environmental Prediction (NCEP) is proposing to stop
running the Regional Spectral Model (RSM) and discontinue all output products
from this model. The RSM is currently only run for a domain over the Hawaiian
Islands. NWS Pacific Region has agreed to the dropping of the RSM run in lieu
of NCEP's adding a Guam domain to its HiResWindow suite in March.
The Regional Spectral Model is a limited-area atmospheric model using a
spectral method for horizontal advection. It uses hydrostatic dynamics and
is run for Hawaii with the equivalent of 10 km horizontal resolution (at 20
North), using a grid of 97x76 points on 42 levels. Runs are made twice daily
from 00z and 12z and run to 48 hours. The domain and terrain height is
It has been run operationally since June 1997 to provide numerical guidance for
use by NWS Weather Forecast Offices in Hawaii. The Hawaii RSM products (211
fields per output time) were only disseminated via the NWS and NCEP FTP servers.
These products are not available on NOAAPORT. At this time, the NWS no longer
has a requirement to produce these runs or products as newer products have been
introduced that meet the needs of the forecasters.
The table below lists characteristics of the RSM and other current [& imminent]
NCEP Operational Products, all of which are based on nonhydrostatic dynamics,
that provide similar or better guidance than the Hawaii RSM that will be removed.
Product Runs/day Range Resolution Grid (see O.N.388) Products
RSM 2 48hr 10km/42lev (see figure above) 211
NAM 4 84hr 12 km/60lev 182 762
[NAM nest] 4 60hr 3 km/60lev 196 875
WRF-ARW 2 48hr 5 km/35lev see here 157
WRF-NMM 2 48hr 4 km/35lev see here 158
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