The global wave ensemble system (GWES) has been providing operational
wave forecasts for the US National Weather Service (NWS) since 2008.
The GWES consists of a 20-member ensemble forced with NCEP-GEFS
bias-corrected wind data, and one control run with NCEP’s
deterministic GFS model.
After upgrades undertaken in July 2014, the GWES runs on a spherical
grid with 1/2° resolution in longitude and latitude, and uses an
efficient wave-generation physics package following Ardhuin et al.
(2010). The current system provides high-quality deep-water wave
forecasts, also generating products for applications in nearshore
areas and under hurricane forcing conditions, a feature that results
from a close interaction between three NCEP centers: the Environmental
Modeling Center (EMC), the National Hurricane Center (NHC), and the
Ocean Prediction Center (OPC).
The viewer controls allow you to select from the last 5 days
at the run times of 00Z, 06Z, 12Z, and 18Z. Spaghetti and Probability maps
include a control to select a threshold value for the selected parameter.
The US National Weather Service also generates operationally a combined wave-height
ensemble product in partnership with the Fleet Numerical Meteorology and Oceanography
Center (FNMOC) of the US Navy. The combined wave ensemble data are at the NFCENS page.