Lake Michigan–Huron OFS

Last cycle 15 Oct 18:00 UTC

lmhofs

Combined Lake Michigan and Lake Huron unstructured forecast: water temperature, currents, ice and water levels on a single FVCOM mesh.

Model FVCOMGrid UGRID (unstructured)Region Great LakesExtent −88.0417, 41.6209 → −79.7129, 46.3503

Produced by NOAA NOS CO-OPS

Coverage

Jul 25 – Oct 20

Cadence

Forecast

120h

Variables

Grid

UGRID

Vertical

20σ-layers

Coveragetime

span 2.9 months4.6 days ahead

now

Jul 25, 2026 15:00ZOct 20, 2026 18:00Z

Access

ZarrAvailable

Zarr store on S3 — open directly for best performance.

s3://noaa-nodd-kerchunk-pds/zarr3/lmhofs.zarr

WMSAvailable

Rendered map tiles for Leaflet, OpenLayers, QGIS.

https://cloud.data.ioos.us/xreds/datasets/lmhofs_zarr3/wms/?service=WMS&request=GetCapabilities

Open in code

python

import xarray as xr

ds = xr.open_zarr(
    "s3://noaa-nodd-kerchunk-pds/zarr3/lmhofs.zarr",
    zarr_format=3,
    consolidated=False,
    storage_options={"anon": True},
)

Lake Michigan–Huron OFS · Zarr v3, anonymous S3

import intake

cat = intake.open_catalog(
    "https://noaa-nodd-kerchunk-pds.s3.amazonaws.com/zarr3/intake.yml",
)
ds = cat["lmhofs"].to_dask()

Lake Michigan–Huron OFS · resolved through the shared catalog

Dimensions9

time1,902four4nele171,377node90,806three3siglev-1 → 0maxelem9maxnode11siglay-1 → 0

Variables57

name	standard name	units	dimensions
temp	sea_water_temperature	degrees_C	timesiglaynode
salinity	sea_water_salinity	1e-3	timesiglaynode
u	eastward_sea_water_velocity	meters s-1	timesiglaynele
v	Northward_sea_water_velocity	meters s-1	timesiglaynele
ww	not declared	meters s-1	timesiglaynele
zeta	sea_surface_height_above_geoid	meters	timenode
uwind_speed	eastward wind	meters s-1	timenele
vwind_speed	northward wind	meters s-1	timenele
atmos_press	not declared	pascals	timenode
aice	ice_area_category	—	timenode
vice	ice_volume_category	m	timenode
uuice	not declared	meters s-1	timenele
vvice	not declared	meters s-1	timenele
tsfc	ice_surface_temperature	deg C	timenode
Times	not declared	—	time
a1u	not declared	—	fournele
a2u	not declared	—	fournele
awx	not declared	—	threenele
awy	not declared	—	threenele
aw0	not declared	—	threenele
iint	not declared	—	time
art2	not declared	—	node
art1	not declared	—	node
km	not declared	m 2 s-1	timesiglevnode
kh	not declared	m 2 s-1	timesiglevnode
kq	not declared	m 2 s-1	timesiglevnode
inundation_cells	not declared	—	timenele
l	not declared	m3 s-2	timesiglevnode
latent_heat_flux	not declared	W m-2	timenode
long_wave	not declared	W m-2	timenode
nbe	not declared	—	threenele
net_heat_flux	not declared	W m-2	timenode
nbve	not declared	—	maxelemnode
nbsn	not declared	—	maxnodenode
nprocs	not declared	—
nv	not declared	—	threenele
ntve	not declared	—	node
ntsn	not declared	—	node
omega	not declared	s-1	timesiglevnode
q2	not declared	m2 s-2	timesiglevnode
q2l	not declared	m3 s-2	timesiglevnode
partition	not declared	—	nele
sensible_heat_flux	not declared	W m-2	timenode
short_wave	not declared	W m-2	timenode
tauc	not declared	m^2 s^-2	timenele
viscofh	not declared	m 2 s-1	timesiglaynode
viscofm	not declared	m 2 s-1	timesiglaynele
wet_cells	not declared	—	timenele
wet_nodes_prev_int	not declared	—	timenode
wet_nodes	not declared	—	timenode
wet_cells_prev_int	not declared	—	timenele
y	not declared	meters	node
x	not declared	meters	node
wet_cells_prev_ext	not declared	—	timenele
yc	not declared	meters	nele
xc	not declared	meters	nele
h	sea_floor_depth_below_geoid	m	node

Attributes16

title

LMHOFS

institution

School for Marine Science and Technology

source

FVCOM_4.4.7

history

model started at: 15/10/2026 19:58

references

http://fvcom.smast.umassd.edu, https://github.com/FVCOM-GitHub/FVCOM

Conventions

CF-1.0

CoordinateSystem

GeoReferenced

CoordinateProjection

proj=utm +zone=16 +datum=NAD83

Tidal_Forcing

Tidal Forcing Time Series Title: lmhofs lateral open boundary netCDF file

River_Forcing

THERE ARE 12 RIVERS IN THIS MODEL. RIVER INFLOW IS ON THE edges WHERE TEMPERATURE AND SALINITY ARE specified IN THE MODEL. THE FOLLOWING RIVER NAMES ARE USED: 04127885 04127885 04159130 04159130 04159130 04157005 04157005 04157005 04157005 040851385 040851385 040851385

GroundWater_Forcing

GROUND WATER FORCING IS OFF!

Surface_Heat_Forcing

FVCOM variable surface heat forcing file: FILE NAME:lmhofs.t18z.20261015.hflux.forecast.nc SOURCE:FVCOM grid (unstructured) surface forcing Unknown start date meta data format

Surface_Wind_Forcing

FVCOM variable surface Wind forcing: FILE NAME:lmhofs.t18z.20261015.met.forecast.nc SOURCE:FVCOM grid (unstructured) surface forcing Unknown start date meta data format

Surface_PrecipEvap_Forcing

FVCOM periodic surface precip forcing: FILE NAME:lmhofs.t18z.20261015.met.forecast.nc SOURCE:FVCOM grid (unstructured) surface forcing Unknown start date meta data format

Ice_Model_Forcing

FVCOM variable surface ice model forcing: FILE NAME:lmhofs.t18z.20261015.met.forecast.nc SOURCE:FVCOM grid (unstructured) surface forcing Unknown start date meta data format

_xpublish_id

lmhofs_zarr3

Source & extent

Model core

FVCOM

Grid type

UGRID (unstructured)

Region

Great Lakes

Spatial extent

−88.0417, 41.6209 → −79.7129, 46.3503

Store format

Zarr v3

Source store

s3://noaa-nodd-kerchunk-pds/zarr3/lmhofs.zarr