GribStream
gefsatmos
GEFS Atmos is NOAA/NCEP’s medium-range atmospheric ensemble. Each cycle runs the GFS 31 times, one control plus 30 perturbed members, to quantify forecast uncertainty. Version 12 uses the FV3 dynamical core and upgraded physics, with stochastic schemes such as SPPT and SKEB applied to represent model uncertainty. Initial condition perturbations and flow-dependent errors are generated consistently with the GFS analysis, producing spread that reflects realistic uncertainty growth. Output includes surface and pressure-level fields for temperature, wind, humidity, precipitation, MSLP, geopotential height, CAPE and related diagnostics.
| Name | Level | Info | Description | Introduced | Min Horizon | Max Horizon |
|---|---|---|---|---|---|---|
| CAPE | surface | Convective Available Potential Energy (J/kg) | 2020-10-01T00:00:00Z | 0 | 240 | |
| CAPE | 180-0 mb above ground | Convective Available Potential Energy (J/kg) | 2020-10-01T00:00:00Z | 0 | 240 | |
| CIN | surface | Convective Inhibition (J/kg) | 2020-10-01T00:00:00Z | 0 | 240 | |
| CIN | 180-0 mb above ground | Convective Inhibition (J/kg) | 2020-10-01T00:00:00Z | 0 | 240 | |
| DPT | 2 m above ground | Dew Point Temperature (K) | 2020-10-01T00:00:00Z | 0 | 240 | |
| GUST | surface | Wind Speed (Gust) (m/s) | 2020-10-01T00:00:00Z | 0 | 240 | |
| HGT | surface | Geopotential Height (gpm) | 2020-10-01T00:00:00Z | 0 | 0 | |
| HGT | cloud ceiling | Geopotential Height (gpm) | 2025-06-18T12:00:00Z | 0 | 240 | |
| HLCY | 3000-0 m above ground | Storm Relative Helicity (m^2/s^2) | 2020-10-01T00:00:00Z | 0 | 240 | |
| ICETK | surface | Ice Thickness (m) | 2020-10-01T00:00:00Z | 0 | 240 | |
| PRES | surface | Pressure (Pa) | 2020-10-01T00:00:00Z | 0 | 240 | |
| PRMSL | mean sea level | Pressure Reduced to MSL (Pa) | 2020-10-01T00:00:00Z | 0 | 240 | |
| PWAT | entire atmosphere (considered as a single layer) | Precipitable Water (kg/m^2) | 2020-10-01T00:00:00Z | 0 | 240 | |
| RH | 2 m above ground | Relative Humidity (%) | 2020-10-01T00:00:00Z | 0 | 240 | |
| SNOD | surface | Snow Depth (m) | 2020-10-01T00:00:00Z | 0 | 240 | |
| SOILW | 0-0.1 m below ground | Volumetric Soil Moisture Content (Fraction) | 2020-10-01T00:00:00Z | 0 | 240 | |
| TMAX | 2 m above ground | Maximum Temperature (K) | 2020-10-01T00:00:00Z | 0 | 240 | |
| TMIN | 2 m above ground | Minimum Temperature (K) | 2020-10-01T00:00:00Z | 0 | 240 | |
| TMP | 2 m above ground | Temperature (K) | 2020-10-01T00:00:00Z | 0 | 240 | |
| TSOIL | 0-0.1 m below ground | Soil Temperature (K) | 2020-10-01T00:00:00Z | 0 | 240 | |
| UGRD | 10 m above ground | U-Component of Wind (m/s) | 2020-10-01T00:00:00Z | 0 | 240 | |
| VGRD | 10 m above ground | V-Component of Wind (m/s) | 2020-10-01T00:00:00Z | 0 | 240 | |
| WEASD | surface | Water Equivalent of Accumulated Snow Depth (kg/m^2) | 2020-10-01T00:00:00Z | 0 | 240 |