GribStream

NOAA AIGEFS Surface Forecasts

GribStream Code: aigefssfc

Description

AIGEFS Surface is the near-surface product from NOAA/NCEP's AI Global Ensemble Forecast System. NOAA implemented AIGEFS v1.0 on December 17, 2025, as a 31-member GraphCast-based AI ensemble alongside the deterministic AIGFS and the HGEFS hybrid ensemble.

NOAA describes the AI-GFS family as GraphCast-based guidance developed by NCEP with NOAA research laboratories and the Earth Prediction Innovation Center. AIGEFS gives users member-level AI forecast scenarios, making it a natural companion to physics-based ensembles such as GEFS and AI ensemble guidance such as AIFS ENS.

This surface dataset is the compact AIGEFS option for applications that need spread across common global weather signals without the full pressure-level atmosphere. It is useful for probabilistic point forecasts, renewable-energy ranges, route-risk screening, medium-range scenario comparison, and AI-vs-physics ensemble checks.

What is in the surface product

The member-level surface dataset includes wind, temperature, humidity, pressure, and precipitation fields for members 0 through 30. Current selectors include 10 m and 100 m U/V wind components, 2 m dew point, 2 m specific humidity, 2 m temperature, mean sea-level pressure, surface pressure, surface temperature, and accumulated precipitation. It runs on the same 0.25 degree global grid as AIGEFS Pressure, with 00, 06, 12, and 18 UTC cycles and 6-hour forecast steps out to 384 hours.

Detail

Parameters

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Click a parameter to reveal ready-to-copy JSON selectors for AIGEFS Surface.

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 2025-06-01
{"name":"APCP","level":"surface","info":""}
DPT –Dew Point Temperature (K)
1 variant
NOAA GRIB2 Table 4.2-0-0

Dew point temperature is the temperature at which the air becomes saturated. It is a direct measure of moisture content.

  • Units: K.
  • When dew point is close to air temperature, fog or low cloud potential increases.
Level Info Horizon Introduced Selector
2 m above ground 0h-384h 2025-06-01
{"name":"DPT","level":"2 m above ground","info":""}
PRES –Pressure (Pa)
1 variant
NOAA GRIB2 Table 4.2-0-3

Pressure is the atmospheric pressure at the specified level. It is a fundamental mass-field variable for dynamics and thermodynamics.

  • Units: Pa.
Level Info Horizon Introduced Selector
surface 0h-384h 2025-06-01
{"name":"PRES","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 2025-06-01
{"name":"PRMSL","level":"mean sea level","info":""}
SPFH –Specific Humidity (kg/kg)
1 variant
NOAA GRIB2 Table 4.2-0-1

Specific humidity is the mass of water vapor per mass of air at the specified level. It is central to moisture transport.

  • Units: kg/kg.
  • Higher values indicate more atmospheric moisture and greater cloud or precip potential.
Level Info Horizon Introduced Selector
2 m above ground 0h-384h 2025-06-01
{"name":"SPFH","level":"2 m above ground","info":""}
TMP –Temperature (K)
2 variants
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 2025-06-01
{"name":"TMP","level":"2 m above ground","info":""}
surface 0h-384h 2025-06-01
{"name":"TMP","level":"surface","info":""}
UGRD –U-Component of Wind (m/s)
2 variants
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 2025-06-01
{"name":"UGRD","level":"10 m above ground","info":""}
100 m above ground 0h-384h 2025-06-01
{"name":"UGRD","level":"100 m above ground","info":""}
VGRD –V-Component of Wind (m/s)
2 variants
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 2025-06-01
{"name":"VGRD","level":"10 m above ground","info":""}
100 m above ground 0h-384h 2025-06-01
{"name":"VGRD","level":"100 m above ground","info":""}

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