GribStream

NOAA AIGFS Surface Forecasts

GribStream Code: aigfssfc

Description

AIGFS Surface is the near-surface dataset from NOAA/NCEP's operational Artificial Intelligence Global Forecast System. NOAA implemented AIGFS v1.0 on December 17, 2025, alongside the AIGEFS AI ensemble and HGEFS hybrid ensemble. AIGFS is the deterministic member of that operational AI global model family.

NOAA describes the AI-GFS family as GraphCast-based guidance developed by NCEP with NOAA research laboratories and the Earth Prediction Innovation Center. The system uses NOAA's operational global analysis as its real-time starting point, which makes it useful as an independent AI forecast alongside physics-based models such as GFS.

This surface dataset is the compact AIGFS option for applications that need the most common global weather signals without the full pressure-level atmosphere. It is useful for point forecasts, operational dashboards, medium-range model comparison, renewable-energy screening, route planning, and AI-vs-physics verification workflows.

What is in the surface product

The surface dataset includes 10 m U/V wind components, 2 m temperature, mean sea-level pressure, and accumulated precipitation. It runs on the same 0.25 degree global grid as AIGFS Pressure, with 00, 06, 12, and 18 UTC cycles and 6-hour forecast steps out to 384 hours.

Detail

Parameters

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APCP –Accumulated Precipitation (kg/m^2)
1 variant
NOAA GRIB2 Table 4.2-0-1

Accumulated precipitation represents the total water-equivalent amount of rain and snow during the output period. It is a primary field for hydrologic impacts and event totals.

  • Units: kg/m^2.
  • Use with the model time interval to interpret totals and compare to gauges.
Level Info Horizon Introduced Selector
surface 6h-384h 2026-04-16
{"name":"APCP","level":"surface","info":""}
PRMSL –Pressure Reduced to Mean Sea Level (Pa)
1 variant
NOAA GRIB2 Table 4.2-0-3

Pressure reduced to mean sea level is MSLP computed from surface pressure and temperature. It is used to locate highs and lows.

  • Units: Pa.
Level Info Horizon Introduced Selector
mean sea level 0h-384h 2026-04-16
{"name":"PRMSL","level":"mean sea level","info":""}
TMP –Temperature (K)
1 variant
NOAA GRIB2 Table 4.2-0-0

Air temperature is the thermal state of the atmosphere at the specified level. It influences density, stability, and energy exchange.

  • Units: K.
Level Info Horizon Introduced Selector
2 m above ground 0h-384h 2026-04-16
{"name":"TMP","level":"2 m above ground","info":""}
UGRD –U-Component of Wind (m/s)
1 variant
NOAA GRIB2 Table 4.2-0-2

U‑component of wind is the east‑west component of the horizontal wind. Combine with v for speed and direction.

  • Units: m/s.
  • Combine u and v components to compute speed and direction.
Level Info Horizon Introduced Selector
10 m above ground 0h-384h 2026-04-16
{"name":"UGRD","level":"10 m above ground","info":""}
VGRD –V-Component of Wind (m/s)
1 variant
NOAA GRIB2 Table 4.2-0-2

V‑component of wind is the north‑south component of the horizontal wind. Combine with u for speed and direction.

  • Units: m/s.
  • Combine u and v components to compute speed and direction.
Level Info Horizon Introduced Selector
10 m above ground 0h-384h 2026-04-16
{"name":"VGRD","level":"10 m above ground","info":""}

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