GribStream

NOAA AI Global Ensemble Forecast System Surface (AIGEFS Surface)

GribStreamコード: aigefssfc

運用ステータス: NOAAは2025-12-17にAIGFS v1.0とAIGEFS v1.0をHGEFSとあわせて運用開始しました。GribStreamでは、これらのデータセットがNOAAの現在のAIベース全球予報ラインです。graphcastは比較や過去検証向けの履歴アーカイブとして残しています。

技術リファレンス: NOAA EAGLE AWS Open Data registry、NCEP AIGEFS products、NOMADS distribution、NWS SCN 25-89、NOAA/NCEP Office Note 521を参照してください。

概要

AIGEFS SurfaceはNOAA/NCEPのAI Global Ensemble Forecast Systemの地表付近プロダクトです。NOAAは2025-12-17に、決定論的AIGFSとHGEFSとあわせて、GraphCastベースの31メンバーアンサンブルとしてAIGEFS v1.0を運用開始しました。

AIGEFSはメンバーごとのAIシナリオを提供し、GEFSのような物理アンサンブルや、AIFS ENSのようなAI予報値を補完します。

単一の予報軌跡ではなく、ばらつき、分位値、超過確率を推定できます。これは、中心値だけでなくリスク範囲が必要なプロダクトで重要です。

データセットaigefssfcはメンバー0から30について、10 mおよび100 mのU/V風、2 m気温、露点、比湿、地表気圧、平均海面気圧、積算降水量を含みます。

詳細

関連データセット

気象パラメータ

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パラメータをクリックすると、コピーしやすいJSONセレクタ付きのコンパクトな表で候補を確認できます。コード、level、selector値はAPIが公開する値をそのまま保持します。

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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