# NOAA National Water Model — AWS Open Data
# Operational NWM outputs: streamflow, soil moisture, snowpack, ponded water.

title: "NOAA National Water Model (AWS Open Data)"
bucket: s3://noaa-nwm-pds
homepage: https://registry.opendata.aws/noaa-nwm-pds/
operator: NOAA Office of Water Prediction

auth:
  mode: anonymous

egress_cost: free
region: us-east-1

# Path pattern:
#   s3://noaa-nwm-pds/nwm.{YYYYMMDD}/{product_type}/nwm.t{HH}z.{product_type}.{output_type}.{tm}.conus.nc
#
# product_type: analysis_assim, short_range (18h), medium_range (10d), long_range (30d)
# output_type: channel_rt (streamflow), land (soil/snow), reservoir
# Also: Alaska, Hawaii, Puerto Rico, coastal Atlantic/Gulf/Pacific domains.
# Archive begins late 2018; updated operationally.

notes: |
  Primary output is NetCDF (not cloud-optimised). Each file is a single-time
  snapshot of all NWM reaches or grid cells for CONUS. Files are 14–137 MB
  depending on product type. channel_rt files carry streamflow (m³/s) for ~2.7M
  NHD+ reaches. Retrospective (1979–2020) at s3://noaa-nwm-retrospective-2-1-pds/
  in Zarr — that is the cloud-native access path for historical analysis.