Météo-France AROME 0.01° Surface Forecast

GribStream Code: aromefrance

Official source: Météo-France publishes the AROME 0.01° packages as hourly analysis and forecast fields on its EURW1S100 regular grid. The current package guide documents the domain, schedule, and field groups. The dataset is available without account registration.

Current GribStream scope: aromefrance exposes 17 surface and near-surface fields from all eight daily cycles, with hourly lead times from 0 to 51 hours and a rolling five-day archive. Eight fields are present at lead zero and 16 are available on forecast hours.

License: Météo-France publishes this dataset under France's Open Licence 2.0, which permits commercial reuse with attribution. GribStream preserves Météo-France as the dataset creator and source.

Description

AROME is Météo-France's operational limited-area model for fine-scale weather over metropolitan France and neighboring countries. Météo-France's system overview traces its operational service to 2008 and describes an ALADIN-derived dynamical core with physical parameterizations largely inherited from the Méso-NH research model.

Since October 2024, AROME-France has used an operational 3DEnVar data-assimilation system. Its flow-dependent ensemble covariances determine how observations influence nearby model grid points, replacing the static, horizontally uniform background-error covariances of the earlier 3D-Var analysis.

The public 0.01° product is a regular latitude-longitude representation of that forecast. It covers a 2,801 by 1,791 rectangular array, but the actual AROME domain is trapezoidal; cells outside the valid model footprint are missing. Applications should therefore use the published coverage rather than assuming every corner of the envelope contains data.

The aromefrance inventory is deliberately surface-focused. It combines temperature, humidity, wind, pressure, and cloud cover with accumulated rain, snow, and graupel; surface-based CAPE; maximum simulated radar reflectivity factor; and synthetic infrared brightness temperature. Météo-France defines these source fields in its ARPEGE/AROME parameter glossary. The reflectivity and brightness-temperature fields are model diagnostics, not radar or satellite observations.

AROME's fine grid can represent localized terrain and convective structures that coarser regional and global products smooth out, but resolution is not certainty. This is a single deterministic forecast with a 51-hour horizon, and small timing or position errors can be important for individual thunderstorms or narrow precipitation bands. Use ensembles and broader-scale models when the application needs explicit uncertainty or longer-range context.

Use the inventory below to choose the exact source-native name, level, and info tuple. Query /api/v2/aromefrance/timeseries for coordinate time series or /api/v2/aromefrance/runs for run-based and gridded extraction.

Detail

• Archive window: Last 5 days
• Official dataset page: https://www.data.gouv.fr/datasets/paquets-arome-resolution-0-01deg/
• Key features:
  • Convection-permitting deterministic guidance from Météo-France's operational AROME limited-area forecasting system, designed for fine-scale weather over metropolitan France and neighboring countries.
  • Regular 0.01 degree output with 2,801 by 1,791 cells across the published 37.5N-55.4N, 12W-16E envelope. The underlying AROME system has an approximately 1.3 km model mesh; 0.01 degree describes this public output grid.
  • Eight complete forecast cycles each day at 00, 03, 06, 09, 12, 15, 18, and 21 UTC, with hourly lead times through 51 hours.
  • Near-surface temperature, humidity, wind and gust components; surface pressure; low, middle, and high cloud cover; convective energy; accumulated rain, snow, and graupel; maximum simulated reflectivity factor; synthetic 10.8 µm brightness temperature; and model terrain altitude.
  • Source parameter names remain explicit in selectors, including T, HU, U_RAF, CAPE_INS, RFLCTVT_MAX, EAU, NEIGE, and BT.
  • Precipitation fields use info = "acc" and accumulate from the forecast analysis time; gust components use info = "max" for each preceding forecast hour. RFLCTVT_MAX is a linear reflectivity factor in mm^6/m^3, not dBZ.
• Resolution: Regular 0.01 degree EURW1S100 latitude-longitude output grid with 2,801 by 1,791 cells from 37.5N to 55.4N and 12W to 16E. The valid model footprint is trapezoidal, so cells outside that footprint are missing.
• Temporal coverage: Eight cycles per day at 00, 03, 06, 09, 12, 15, 18, and 21 UTC. Every cycle provides hourly lead times from analysis through 51 hours in the current GribStream surface collection.
• Primary uses: Short-range convective-weather applications, localized precipitation and precipitation-type guidance, flood and catchment workflows, aviation and transport operations, wind and power-demand forecasting, agriculture, outdoor event planning, forecast verification, and comparison with broader European or global guidance.

Related datasets

• DWD ICON-EU for continent-scale European guidance through five days
• ItaliaMeteo ICON-2I for 2.2 km regional guidance centered on Italy
• DMI HARMONIE DINI for 2 km surface guidance over Northwestern Europe
• ECMWF IFS for global deterministic context and a longer forecast range

Parameters