data api · United States

NOAA GEFS analysis

time-optimized · Global · variable subset · 0.25° · 2000-01-01 UTC to Present · 3 hourly step Weather analysis from the Global Ensemble Forecast System (GEFS) model operated by NOAA NWS NCEP, transformed into Zarr format by dynamical.org.

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What's in it

Data offered docs-verified: 2 m temperature (temperature_2m) · 2 m maximum and minimum temperature · 2 m relative humidity · total precipitation rate · percent frozen precipitation · categorical rain, snow, ice pellets and freezing rain flags · surface pressure · pressure reduced to mean sea level · precipitable water · total cloud cover · 10 m and 100 m U/V wind components · surface downward short-wave and long-wave radiation flux · geopotential height cloud ceiling
Coverage docs-verified: Global · 2000-01-01 UTC to Present
Resolution docs-verified: 0.25 degrees (~20km) spatial; 3.0 hours temporal
Formats docs-verified: Zarr
Access docs-verified: Public, no API key; anonymous HTTPS/S3 access (ENTRY); optional email query parameter; licence not stated in docs (ENTRY: see product README)

Useful for

Use cases llm-inferred: Historical antecedent rainfall, temperature and wind context for flood event reconstruction · Freeze-thaw and frozen-precipitation screening for winter civils works · Surface radiation and cloud-cover inputs for site evaporation or energy assessments · Gridded historical meteorological inputs for hydrological model calibration where gauge data is sparse
Audience llm-inferred: hydrologists · flood consultants · drainage engineers · GIS analysts

Limitations

Constraints docs-verified: Unavailable before 2020-01-01 for relative_humidity_2m and the categorical precipitation-type variables · geopotential_height_cloud_ceiling unavailable 2020-01-01T00 to 2020-09-22T21 · Analysis archive of past weather (best estimate), not forecast data · 2020-01-01 to 2020-09-23 source is 1.0 degree and 6-hourly, bilinearly and linearly interpolated to 0.25 degree and 3-hourly · 100 m wind components from 2020-09-23 onward have 0.5 degree source resolution and are interpolated · Values rounded in binary floating point representation for compression · Requires xarray>=2025.1.2 and zarr>=3.0.4 for Zarr v3 support · Licence not stated in docs

Licence: see product README
Authentication: Public; anonymous HTTPS/S3 access via data.source.coop
GitHub stars: Unknown
Last commit: Unknown
Last successful page check: 14/10/2026
Page health: page reachable
Package: Not recorded
Verification: Not independently verified

Provenance & evidence

Verified via Source Cooperative API /api/v1/products/dynamical (public product, updated 2026-07-24).

Metadata observed 14/10/2026 · research sweep: manual-2026-10-15 (source.coop)