Meltemus Grib Service

The Meltemus grib service provides access to high-resolution weather, wave, current and tide data directly from qtVlm, on all platforms (Windows, MacOS, Linux, Android, iOS and Raspberry) and with no limit on the number of devices: use your subscription in parallel on your computer, tablet and phone.

The latest version of qtVlm is required to perform the download. The resulting files are standard GRIB files that can then be used in any compatible application.

GFS data (atmosphere and waves) are free for all qtVlm users. The subscription gives access to all the models listed below.

Atmospheric models provide as applicable: wind (surface and altitude), pressure, temperature, dew point, humidity, gusts, precipitation, cloud cover, CAPE/CIN, visibility, ice (cover and thickness), reflectivity, 0°C isotherm.

Subscription pricing

A single subscription gives access to all the models listed below. Choose the duration that matches your usage:

The grib data subscription is independent of the qtVlm license. qtVlm is free on Windows, MacOS, Linux and Raspberry; on Android, iOS and Windows tablets, the full version (one-time purchase) is still required to fully exploit the downloaded data (routing, advanced charts…).

Buy

Access to the service is via a Meltemus account. Following your purchase, we will create this account and send you the connection details by email, which you can then enter in the qtVlm license manager (menu->qtVlm->License management). As this account creation is done manually on our side, a short delay may occur between your purchase and the effective activation of your subscription.

Model coverage map

Click on a zone to see the model details. Use the filters to show/hide categories.

Open map in full screen

Atmospheric models - Global coverage

Atmospheric models - High-resolution regional

Waves

Currents and tides

The OFS model for US tide and current forecasts have been expanded to also provide the digital depth data used in the model as well as the forecasted water depth based on these depths and the forecasted tides.

NCOM (Navy Coastal Ocean Model) complements RTOFS over US and Caribbean waters with ~3× finer resolution (~3.7 km vs ~9 km).

OSCAR (NASA/ESR) provides the observed global surface current (satellite analysis, daily average over the top ~30 m), with about a 2-day latency. It is an analysis field (not a forecast): useful as a homogeneous global current layer where regional forecast models do not reach.

Ensemble models (probabilistic forecasts)

These models provide multiple forecast scenarios (members) instead of a single deterministic track. They allow qtVlm to produce stochastic routings, spaghetti plots, and to assess forecast uncertainty. Files are multi-record (one record per member) and can be used directly in qtVlm.

Global coverage for all ensemble models.

Buy

Data provider attributions

ECMWF (IFS, ENS):

Based on data and products of the European Centre for Medium-Range Weather Forecasts (ECMWF). ECMWF does not accept any liability whatsoever for any error or omission in the data, their availability, or for any loss or damage arising from their use.

DWD (ICON):

Source: Deutscher Wetterdienst. Datenlizenz Deutschland - Namensnennung - Version 2.0 (DL-DE/BY-2.0).

KNMI (HARMONIE):

Source: KNMI (Royal Netherlands Meteorological Institute). CC-BY 4.0.

Rijkswaterstaat (Matroos):

Source: Rijkswaterstaat (Netherlands), Matroos / DCSM-FM service. [LICENSE TO BE CONFIRMED].

DMI (WAM North Sea/Baltic waves):

Danish Meteorological Institute (DMI). CC-BY 4.0.

MET Norway (MetCoOp 1km Nordic):

Source: MET Norway (Norwegian Meteorological Institute). NLOD 2.0 and CC-BY 4.0.

MeteoSwiss (ICON-CH1 / ICON-CH2):

Source: MeteoSwiss (Federal Office of Meteorology and Climatology). CC-BY 4.0.

Météo-France (ARPEGE, AROME, MFWAM):

Source: Météo-France. Licence Ouverte Etalab 2.0.

Copernicus Marine Service (CMEMS):

Generated using E.U. Copernicus Marine Service Information. Products are provided without any express or implied warranty regarding quality, accuracy, availability, or fitness for purpose.

SHOM:

Source: Shom. Licence Ouverte Etalab 2.0.

Ifremer (MARC — coastal WW3 waves + MARS2D currents):

Source: Ifremer (MARC platform). Licence Ouverte Etalab 2.0.

ItaliaMeteo (ICON-2I):

Source: National Agency for Meteorology and Climatology "ItaliaMeteo". CC-BY 4.0.

ItaliaMeteo / ISAC-CNR (MOLOCH):

Source: National Agency for Meteorology and Climatology "ItaliaMeteo" / ISAC-CNR. CC-BY 4.0.

ItaliaMeteo (WRF LaMMA):

Source: National Agency for Meteorology and Climatology "ItaliaMeteo". CC-BY-SA 4.0 — derived data must remain under CC-BY-SA 4.0.

UK Met Office (AMM15, Global, UKV):

Contains public sector information licensed under the Open Government Licence v3.0. Atmospheric data (Global Deterministic 10km, UKV 2km) © British Crown Copyright, the Met Office — licensed under CC BY-SA. The Information is licensed 'as is' and the Information Provider excludes all representations, warranties, obligations and liabilities in relation to the Information to the maximum extent permitted by law.

NOAA (GFS, GEFS, HRRR, OFS, RTOFS, NCOM):

Data provided by NOAA/National Weather Service (NCOM produced in collaboration with the U.S. Navy). Public domain (US Government).

OSCAR (NASA / ESR):

Ocean Surface Current Analyses Real-time (OSCAR) — Dohan, K. (ESR), NASA Physical Oceanography DAAC (PO.DAAC), DOI:10.5067/OSCAR-25N20. OSCAR products are supported by NASA and may be freely distributed (public domain / CC0).

ECCC (Canada RDPS, HRDPS, RDWPS):

Contains information licensed under the Environment and Climate Change Canada Data Servers End-use Licence.