NOAA GEFS

The Global Ensemble Forecast System (GEFS) is a National Oceanic and Atmospheric Administration (NOAA) National Centers for Environmental Prediction (NCEP) weather forecast model. GEFS creates 31 separate forecasts (ensemble members) to describe the range of forecast uncertainty.

dynamical.org republishes NOAA GEFS as free, analysis-ready Icechunk Zarr archives — open them directly with Xarray, no GRIB wrangling or bulk downloads.

Forecasts

• NOAA GEFS forecast, 35 daynoaa-gefs-forecast-35-day
  time-optimized
  Global · 26 variables · 0-240 hours: 0.25 degrees, 243-840 hours: 0.5 degrees

Analyses

• NOAA GEFS analysisnoaa-gefs-analysis
  time-optimized
  Global · 26 variables · 0.25 degrees

Data access

• STAC catalog (browse) — the machine-readable source of truth.
• AWS Open Data Registry entry · browse the S3 bucket