---
license: cc-by-4.0
tags:
- weather
- nbm
- noaa
- zarr
- conus
pretty_name: NOAA NBM CONUS Daily Analysis
---

# NOAA NBM CONUS Daily Analysis (Zarr)

Daily best-estimate analysis derived from NOAA NBM (National Blend of Models)
CONUS forecasts, on the native ~2.5 km Lambert conformal grid (2345 x 1597).
Built by [nbm-to-zarr](https://github.com/andrewnakas/nbm-to-zarr), dynamical.org-style.

- **Variables:** tmean / tmax / tmin (degC), precip (mm), srad (MJ/m2/day)
- **Construction:** best estimate for day D = lead-day 1 of that day's 00z NBM init
- **Coverage:** rolling backfill from 2020-10-01 (AWS NBM archive floor) to present
- **Layout:** one standalone Zarr per ISO week under `YYYY-Www/`

## Usage

```python
import xarray as xr
ds = xr.open_zarr("https://huggingface.co/datasets/nakas/nbm-conus-analysis/resolve/main/2026-W23")
ds.tmean.isel(time=0).plot()
```

Concatenate weeks along `time` to span longer periods.

Source: NOAA NBM via the AWS Open Data Program (public domain). Derived data CC-BY-4.0.