GribStream

Global Ensemble Forecast System (GEFS Atmos Mean)

GribStream Code: gefsatmosmean

Description

GEFS Atmos Mean summarizes NOAA's atmospheric GEFS ensemble into mean forecast fields. Instead of choosing one member, it provides a central signal from the ensemble, useful when a product needs a stable global reference for medium-range conditions.

The ensemble mean does not replace full probabilistic analysis. Use GEFS Atmos when you need individual members, percentiles, ranges, or exceedance probabilities. Use gefsatmosmean when the workflow needs a less noisy baseline for temperature, wind, precipitation, pressure, geopotential height, and related atmospheric fields.

In GribStream, GEFS Atmos Mean follows the same point, grid, /timeseries, and /runs API patterns as the rest of the GEFS family. It is practical for agriculture, energy, logistics, hydrology, emergency management, research baselines, and model-comparison workflows that need a representative global scenario through 240 hours.

Detail

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Parameters

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Click a parameter to reveal variants in a compact table with ready-to-copy JSON selectors.

CAPE –Convective Available Potential Energy (J/kg)
2 variants
NOAA GRIB2

Convective Available Potential Energy (CAPE) quantifies buoyant energy available to rising air parcels. Larger values generally imply stronger potential updrafts and greater convective intensity.

  • Units: J/kg.
  • Often used with CIN and lifting mechanisms to assess thunderstorm potential.
Level Info Horizon Introduced Selector
180-0 mb above ground ens mean 0h-240h 2020-10-01
{"name":"CAPE","level":"180-0 mb above ground","info":"ens mean"}
surface ens mean 0h-240h 2020-10-01
{"name":"CAPE","level":"surface","info":"ens mean"}
CIN –Convective Inhibition (J/kg)
2 variants
NOAA GRIB2

Convective Inhibition (CIN) measures the energy barrier that must be overcome to initiate convection. More negative values indicate a stronger cap that can suppress storms.

  • Units: J/kg.
  • When CIN is weak and CAPE is high, convection is more likely.
Level Info Horizon Introduced Selector
180-0 mb above ground ens mean 0h-240h 2020-10-01
{"name":"CIN","level":"180-0 mb above ground","info":"ens mean"}
surface ens mean 0h-240h 2020-10-01
{"name":"CIN","level":"surface","info":"ens mean"}
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 ens mean 0h-240h 2020-10-01
{"name":"DPT","level":"2 m above ground","info":"ens mean"}
GUST –Wind Speed (Gust) (m/s)
1 variant
NOAA GRIB2 Table 4.2-0-2

Wind gust is the peak short-duration wind speed. It captures brief, hazardous bursts that can exceed sustained winds.

  • Units: m/s.
Level Info Horizon Introduced Selector
surface ens mean 0h-240h 2020-10-01
{"name":"GUST","level":"surface","info":"ens mean"}
HGT –Geopotential Height (gpm)
2 variants
NOAA GRIB2 Table 4.2-0-3

Geopotential height is the altitude of a pressure surface in the atmosphere. It is the primary field for identifying ridges, troughs, and large‑scale flow patterns.

  • Units: gpm.
Level Info Horizon Introduced Selector
cloud ceiling ens mean 0h-240h 2022-10-18
{"name":"HGT","level":"cloud ceiling","info":"ens mean"}
surface ens mean 0h 2020-10-01
{"name":"HGT","level":"surface","info":"ens mean"}
HLCY –Storm Relative Helicity (m^2/s^2)
1 variant
NOAA GRIB2 Table 4.2-0-2

Storm-relative helicity measures the potential for streamwise vorticity to be ingested by a storm updraft. Higher values suggest a greater likelihood of rotating updrafts.

  • Units: m^2/s^2.
  • Commonly evaluated in the lowest 1 to 3 km layer.
Level Info Horizon Introduced Selector
3000-0 m above ground ens mean 0h-240h 2020-10-01
{"name":"HLCY","level":"3000-0 m above ground","info":"ens mean"}
ICETK –Ice Thickness (m)
1 variant
NOAA GRIB2 Table 4.2-0-1

Ice thickness is the physical thickness of sea or lake ice. It is important for marine navigation and heat exchange.

  • Units: m.
Level Info Horizon Introduced Selector
surface ens mean 0h-240h 2020-10-01
{"name":"ICETK","level":"surface","info":"ens mean"}
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 ens mean 0h-240h 2020-10-01
{"name":"PRES","level":"surface","info":"ens mean"}
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 ens mean 0h-240h 2020-10-01
{"name":"PRMSL","level":"mean sea level","info":"ens mean"}
PWAT –Precipitable Water (kg/m^2)
1 variant
NOAA GRIB2 Table 4.2-0-1

Precipitable water is the total column water vapor from the surface to the top of the atmosphere. It is a key moisture indicator.

  • Units: kg/m^2.
Level Info Horizon Introduced Selector
entire atmosphere (considered as a single layer) ens mean 0h-240h 2020-10-01
{"name":"PWAT","level":"entire atmosphere (considered as a single layer)","info":"ens mean"}
RH –Relative Humidity (percent)
1 variant
NOAA GRIB2 Table 4.2-0-1

Relative humidity describes how close the air is to saturation at the specified level. High values favor cloud formation.

  • Units: percent.
  • Higher values indicate more atmospheric moisture and greater cloud or precip potential.
Level Info Horizon Introduced Selector
2 m above ground ens mean 0h-240h 2020-10-01
{"name":"RH","level":"2 m above ground","info":"ens mean"}
SNOD –Snow Depth (m)
1 variant
NOAA GRIB2 Table 4.2-0-1

Snow depth is the physical thickness of the snowpack. It is distinct from snow water equivalent, which measures water content.

  • Units: m.
Level Info Horizon Introduced Selector
surface ens mean 0h-240h 2020-10-01
{"name":"SNOD","level":"surface","info":"ens mean"}
SOILW –Volumetric Soil Moisture Content (Fraction)
1 variant
NOAA GRIB2 Table 4.2-2-0

Volumetric soil moisture is the fraction of soil volume occupied by water. It is commonly used in hydrology and drought monitoring.

  • Units: Fraction.
  • Soil state affects evapotranspiration and boundary-layer moisture.
Level Info Horizon Introduced Selector
0-0.1 m below ground ens mean 0h-240h 2020-10-01
{"name":"SOILW","level":"0-0.1 m below ground","info":"ens mean"}
TMAX –Maximum Temperature (K)
1 variant
NOAA GRIB2 Table 4.2-0-0

Maximum temperature is the highest temperature reached during the output period. It is commonly used for heat stress and daily extremes.

  • Units: K.
Level Info Horizon Introduced Selector
2 m above ground ens mean 0h-240h 2020-10-01
{"name":"TMAX","level":"2 m above ground","info":"ens mean"}
TMIN –Minimum Temperature (K)
1 variant
NOAA GRIB2 Table 4.2-0-0

Minimum temperature is the lowest temperature reached during the output period. It is commonly used for frost and cold-stress assessment.

  • Units: K.
Level Info Horizon Introduced Selector
2 m above ground ens mean 0h-240h 2020-10-01
{"name":"TMIN","level":"2 m above ground","info":"ens mean"}
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 ens mean 0h-240h 2020-10-01
{"name":"TMP","level":"2 m above ground","info":"ens mean"}
TSOIL –Soil Temperature (K)
1 variant
NOAA GRIB2 Table 4.2-0-0

Soil temperature describes the thermal state of the soil layer. It affects ground heat flux and freeze/thaw processes.

  • Units: K.
  • Soil state affects evapotranspiration and boundary-layer moisture.
Level Info Horizon Introduced Selector
0-0.1 m below ground ens mean 0h-240h 2020-10-01
{"name":"TSOIL","level":"0-0.1 m below ground","info":"ens mean"}
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 ens mean 0h-240h 2020-10-01
{"name":"UGRD","level":"10 m above ground","info":"ens mean"}
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 ens mean 0h-240h 2020-10-01
{"name":"VGRD","level":"10 m above ground","info":"ens mean"}
WEASD –Water Equivalent of Accumulated Snow Depth (kg/m^2)
1 variant
NOAA GRIB2 Table 4.2-0-1

Snow water equivalent (SWE) is the total liquid water stored in the snowpack. It integrates depth and density of existing snow.

  • Units: kg/m^2.
  • Accumulations represent water-equivalent depth over the output interval; rates describe intensity.
Level Info Horizon Introduced Selector
surface ens mean 0h-240h 2020-10-01
{"name":"WEASD","level":"surface","info":"ens mean"}

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