Met Office Global Deterministic 10 km

GribStream Code: metofficeglobal10km

A global forecast from the Met Office

The Met Office Global Deterministic model brings another physics-based global forecast to the same GribStream query interface used for GFS and ECMWF IFS. Its roughly 10 km output covers the world, not just the United Kingdom.

The collection includes 40 weather parameters with 336 current level and statistic combinations for point forecasts, weather dashboards and matched-run model comparisons. This is a single deterministic forecast, not an ensemble or a calibrated probability product.

Included fields

• Screen level, 1.5 m above ground: air temperature and dew point in K; relative humidity as a fraction, not percent.
• Mean sea level: air pressure in Pa.
• 10 m above ground: wind speed in m/s and wind-from direction in degrees.
• Surface and column weather: precipitation rates and accumulations, snow, visibility, cloud, radiation, heat fluxes, CAPE and CIN.
• Pressure and cloud-height levels: temperature, humidity, wind, geopotential height, upward velocity and cloud fraction. Available levels depend on the parameter and forecast date.

Use the exact name, level and info selectors in the inventory below. Screen-level fields are at 1.5 m, not 2 m. Interval statistics such as 3h_sum describe the preceding interval; they are not instantaneous values. Native units are preserved: water-equivalent precipitation is in metres or metres per second, and cloud and humidity fractions are not percentages.

Pressure-level points below the model terrain are returned as missing values. Pressure-level wet-bulb potential temperature is included. UKV, MOGREPS-G and MOGREPS-UK are separate datasets in the same Met Office family.

A sample of the global forecast

Cycles and forecast steps

Forecast reference times are 00, 06, 12 and 18 UTC. For most instantaneous fields, 00 and 12 UTC cycles extend to 168 hours: hourly through +54, every three hours from +57 to +144, then every six hours from +150 to +168. Short cycles generally extend to +69 after the January 2026 upgrade and +66 before it. Some radiation products and interval statistics have different schedules; the inventory gives selector-specific lead-time bounds, not a promise that every intervening hour exists.

A cycle time is the start of the forecast, not its publication time. The upstream registry describes a typical delay of three to six hours.

History and source terms

The upstream source retains a rolling two-year window. GribStream launches with recent forecasts; earlier runs are being added over the coming days. The full upstream archive is not yet available through GribStream. Some upper-air levels and forecast steps became available with the January 2026 upgrade; their start dates are shown in the inventory.

GribStream coverage is currently partial and varies by parameter and run. Individual source files and forecast steps can be missing, and expired data is no longer accessible. A parameter's introduction date is not a guarantee of uninterrupted observations or forecasts. This is a rolling archive, not permanent storage.

British Crown copyright 2023–2025, the Met Office. Source data is licensed under CC BY-SA 4.0. Preserve attribution and consult the license for reuse and adaptation terms. GribStream is independent of the Met Office. The source feed is offered without operational support and is not recommended by the provider for critical business uses.

Dataset details

• Archive window: Rolling 3-day launch window; history expanding
• Coverage: global; 2,560 longitude by 1,920 latitude points.
• Grid spacing: 0.140625° longitude by 0.09375° latitude; approximately 10 km model resolution.
• Cycles: 00, 06, 12 and 18 UTC.
• Forecast type: deterministic; no ensemble-member selector.
• Documentation: Met Office Global 10 km data sheet.

Parameters