Chesapeake Bay OFS

Last cycle 15 Oct 18:00 UTC
cbofs

Operational ROMS nowcast/forecast for Chesapeake Bay and the adjacent Mid-Atlantic shelf: temperature, salinity, currents, dissolved oxygen and water level.

Model ROMSGrid SGRID (curvilinear)Region US East CoastExtent −81.1744, 36.1904 → −74.2308, 39.6118

Produced by NOAA NOS CO-OPS

Chesapeake Bay OFS temp
Coverage
Sep 25 – Oct 17
Cadence
6h
Forecast
48h
Variables
96
Grid
291×332
Vertical
20σ-levels

Coverageocean_time

span 22 days39 h ahead
now
Sep 25, 2026 13:00ZOct 17, 2026 18:00Z

Access

ZarrAvailable

Zarr store on S3 — open directly for best performance.

s3://noaa-nodd-kerchunk-pds/zarr3/cbofs.zarr
WMSAvailable

Rendered map tiles for Leaflet, OpenLayers, QGIS.

https://cloud.data.ioos.us/xreds/datasets/cbofs_zarr3/wms/?service=WMS&request=GetCapabilities

Open in code

python
import xarray as xr

ds = xr.open_zarr(
    "s3://noaa-nodd-kerchunk-pds/zarr3/cbofs.zarr",
    zarr_format=3,
    consolidated=False,
    storage_options={"anon": True},
)
Chesapeake Bay OFS · Zarr v3, anonymous S3
import intake

cat = intake.open_catalog(
    "https://noaa-nodd-kerchunk-pds.s3.amazonaws.com/zarr3/intake.yml",
)
ds = cat["cbofs"].to_dask()
Chesapeake Bay OFS · resolved through the shared catalog

Dimensions13

tracer3s_rho-1 → 0s_w-1 → 0boundary4ocean_time534eta_rho291xi_rho332eta_psi290xi_psi331eta_v290xi_v332eta_u291xi_u331

Variables96

namestandard nameunitsdimensions
tempsea_water_potential_temperatureCelsius
ocean_times_rhoeta_rhoxi_rho
saltsea_water_practical_salinity—
ocean_times_rhoeta_rhoxi_rho
usea_water_x_velocitymeter second-1
ocean_times_rhoeta_uxi_u
vsea_water_y_velocitymeter second-1
ocean_times_rhoeta_vxi_v
wupward_sea_water_velocitymeter second-1
ocean_times_weta_rhoxi_rho
zetasea_surface_height_above_geopotential_datummeter
ocean_timeeta_rhoxi_rho
oxygenmole_concentration_of_dissolved_oxygen_in_sea_watermillimole_oxygen meter-3
ocean_times_rhoeta_rhoxi_rho
Uwindsurface_x_windmeter second-1
ocean_timeeta_rhoxi_rho
Vwindsurface_y_windmeter second-1
ocean_timeeta_rhoxi_rho
Pairsurface_air_pressuremillibar
ocean_timeeta_rhoxi_rho
Akp_baknot declaredmeter2 second-1
BioIternot declared—
Akt_baknot declaredmeter2 second-1
tracer
Akv_baknot declaredmeter2 second-1
Charnok_alphanot declared—
Cs_rnot declared—
s_rho
CrgBan_cwnot declared—
Akk_baknot declaredmeter2 second-1
Cs_wnot declared—
s_w
Falphanot declared—
FSobc_outnot declaredsecond-1
boundary
Lm2CLMnot declared—
Fbetanot declared—
FSobc_innot declaredsecond-1
boundary
Fgammanot declared—
LnudgeM2CLMnot declared—
LnudgeM3CLMnot declared—
Lm3CLMnot declared—
LnudgeTCLMnot declared—
tracer
LtracerCLMnot declared—
tracer
LsshCLMnot declared—
LtracerSpongenot declared—
tracer
LtracerSrcnot declared—
tracer
LwSrcnot declared—
M2nudgnot declaredday-1
LuvSpongenot declared—
M2obc_innot declaredsecond-1
boundary
M3obc_innot declaredsecond-1
boundary
M3nudgnot declaredday-1
M2obc_outnot declaredsecond-1
boundary
LuvSrcnot declared—
M3obc_outnot declaredsecond-1
boundary
Tclinenot declaredmeter
Tnudgnot declaredday-1
tracer
ResRatenot declaredday-1
Tobc_innot declaredsecond-1
boundarytracer
Tobc_outnot declaredsecond-1
boundarytracer
Vstretchingnot declared—
Vtransformnot declared—
Znudgnot declaredday-1
Zosnot declaredmeter
Zobnot declaredmeter
Zos_hsig_alphanot declared—
dtfastnot declaredsecond
anglegrid_angle_of_rotation_from_east_to_yradians
eta_rhoxi_rho
dtnot declaredsecond
fcoriolis_parametersecond-1
eta_rhoxi_rho
elnot declaredmeter
gamma2not declared—
gls_c1not declared—
gls_Kminnot declared—
gls_c2not declared—
gls_Pminnot declared—
gls_c3mnot declared—
gls_cmu0not declared—
gls_c3pnot declared—
gls_nnot declared—
gls_mnot declared—
gls_pnot declared—
gridnot declared—
gls_sigpnot declared—
hsea_floor_depthmeter
eta_rhoxi_rho
hcnot declaredmeter
gls_sigknot declared—
mask_psiland_sea_mask_at_cell_corners—
eta_psixi_psi
mask_vland_sea_mask_at_cell_x_edges—
eta_vxi_v
mask_rholand_sea_mask_at_cell_center—
eta_rhoxi_rho
mask_uland_sea_mask_at_cell_y_edges—
eta_uxi_u
nRSTnot declared—
nHISnot declared—
nSTAnot declared—
ndefHISnot declared—
ndtfastnot declared—
nl_visc2not declaredmeter2 second-1
ntimesnot declared—
pninverse_grid_y_spacingmeter-1
eta_rhoxi_rho
pminverse_grid_x_spacingmeter-1
eta_rhoxi_rho
rdrg2not declared—
rdrgnot declaredmeter second-1
nl_tnu2not declaredmeter2 second-1
tracer
sphericalnot declared—
rho0not declaredkilogram meter-3
sz_alphanot declared—
theta_snot declared—
theta_bnot declared—
xlnot declaredmeter

Attributes39

file
cbofs.t18z.20261015.fields.nowcast_0002.nc
format
netCDF-4/HDF5 file
Conventions
CF-1.4, SGRID-0.3
type
ROMS/TOMS history file
title
cbofs nowcast RUN in operational mode
var_info
varinfo.yaml
rst_file
cbofs.t18z.20261015.rst.nowcast.nc
his_base
cbofs.t18z.20261015.fields.nowcast
sta_file
cbofs.t18z.20261015.stations.nowcast.nc
grd_file
cbofs.romsgrid.nc
ini_file
cbofs.t18z.20261015.init.nowcast.nc
river_file
cbofs.t18z.20261015.river.nc
tide_file
cbofs.roms.tides.nc
frc_file_01
cbofs.t18z.20261015.met.nowcast.nc
frc_file_02
cbofs.respirate.nc
bry_file_01
cbofs.t18z.20261015.obc.nc
script_file
cbofs_ROMS_nowcast.in
bpar_file
cbofs.bio.in
spos_file
cbofs.stations.in
NLM_TADV
ADVECTION: HORIZONTAL VERTICAL temp: HSIMT HSIMT salt: HSIMT HSIMT oxygen: HSIMT HSIMT
NLM_LBC
EDGE: WEST SOUTH EAST NORTH zeta: Clo Cha Cha Clo ubar: Clo Fla Fla Clo vbar: Clo Fla Fla Clo u: Clo Rad Rad Clo v: Clo Rad Rad Clo temp: Clo RadNud RadNud Clo salt: Clo RadNud RadNud Clo oxygen: Clo RadNud RadNud Clo tke: Clo Gra Gra Clo
git_url
https://github.com/NOAA-CO-OPS/2024-NOS-Code-Package_v3.6.0
git_rev
c1e184cd03c2208a7b6924f2ef264d1c9feeb838
svn_url
https://www.myroms.org/svn/src/trunk
svn_rev
1209
code_dir
/lfs/h1/ops/test/packages/nosofs.v3.6.15/sorc/ROMS.fd
header_dir
/lfs/h1/ops/test/packages/nosofs.v3.6.15/include
header_file
cbofs.h
os
Linux
cpu
x86_64
compiler_system
ftn-intel
compiler_command
/opt/cray/pe/craype/2.7.17/bin/ftn
compiler_flags
-fp-model precise -ip -O3
tiling
008x016
history
ROMS/TOMS, Version 4.2, Thursday - October 15, 2026 - 6:52:25 PM
ana_file
ROMS/Functionals/ana_btflux.h, ROMS/Functionals/ana_rain.h, ROMS/Functionals/ana_stflux.h
CPP_options
mode, ADD_FSOBC, ADD_M2OBC, ANA_BPFLUX, ANA_BSFLUX, ANA_BTFLUX, ANA_RAIN, ANA_SPFLUX, ANA_SSFLUX, ASSUMED_SHAPE, ATM_PRESS, BOUNDARY_ALLREDUCE, BULK_FLUXES, COLLECT_ALLGATHER, CURVGRID, DIFF_GRID, DJ_GRADPS, DOUBLE_PRECISION, EMINUSP, GLS_MIXING, HDF5, HYPOXIA_SRM, LIMIT_STFLX_COOLING, KANTHA_CLAYSON, LONGWAVE_OUT, MASKING, MIX_GEO_TS, MIX_S_UV, MPI, NONLINEAR, NONLIN_EOS, NO_LBC_ATT, N2S2_HORAVG, PERFECT_RESTART, POWER_LAW, PROFILE, K_GSCHEME, RADIATION_2D, REDUCE_ALLREDUCE, !RST_SINGLE, SALINITY, STEP2D_LF_AM3, SOLAR_SOURCE, SOLVE3D, SSH_TIDES, STATIONS, SURFACE_DO_SATURATION, TS_DIF2, UV_ADV, UV_COR, UV_U3HADVECTION, UV_C4VADVECTION, UV_QDRAG, UV_TIDES, UV_VIS2, VAR_RHO_2D, VISC_GRID
bio_file
ROMS/Nonlinear/Biology/hypoxia_srm.h
_xpublish_id
cbofs_zarr3

Source & extent

Model core
ROMS
Grid type
SGRID (curvilinear)
Region
US East Coast
Spatial extent
−81.1744, 36.1904 → −74.2308, 39.6118
Store format
Zarr v3
Source store
s3://noaa-nodd-kerchunk-pds/zarr3/cbofs.zarr