WeatherNext forecasts are generated operational runs published across
**Google Cloud Storage (Zarr)** , **Google Earth Engine** , and **Google
BigQuery**.

All times are in **UTC (Coordinated Universal Time)** and represent target
dissemination estimates (with a typical ±15 minute variance).
Occasionally, delivery times may vary by ±60 minutes or more due to
upstream satellite or reanalysis ingest latency. If data delivery exceeds +60
minutes past the estimated window, contact us at
[weathernext@google.com](mailto:weathernext@google.com).

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## WeatherNext 3

WeatherNext 3 is initialized **every hour** (00:00, 01:00, 02:00, ..., 23:00
UTC) using live geostationary satellite mosaics
([SatWeave](https://developers.google.com/weathernext/guides/satweave.md.txt)) and ECMWF analysis.

- **Google Cloud Storage (Full Ensemble):** Receives the full 64-member ensemble across all surface grids, station points, and 13 atmospheric pressure levels in `gs://weathernext3_spatial/weathernext_3_0_0/zarr/` first.
- **Google Cloud Storage (Spatial Statistics):** Receives precomputed summary statistics (`_mean`, `_p10`, `_p25`, `_p50`, `_p75`, `_p90`) for all 0.1° and 0.05° surface variables in `gs://weathernext3_statistics_spatial/weathernext_3_0_0_statistics/zarr/`.
- **BigQuery \& Earth Engine:** Ingest precomputed surface ensemble statistics across the 0.1° gridded (`weathernext_3_0_0_0p1deg`) and 0.05° station (`weathernext_3_0_0_0p05deg`) products from the GCS statistics Zarr store shortly after dataset materialization.

The following table outlines target dissemination times for the four main
6-hourly forecast cycles (00:00, 06:00, 12:00, 18:00 UTC), which provide the
full 15-day (360-hour) forecast horizon:

| Forecast Run (Init Time UTC) | Forecast Horizon | GCS Full Ensemble / Stats Zarr | BigQuery \& Earth Engine |
| 00:00 UTC | 15 days (360 hours) | 07:45 UTC | 08:10 UTC |
| 06:00 UTC | 15 days (360 hours) | 13:45 UTC | 14:10 UTC |
| 12:00 UTC | 15 days (360 hours) | 19:45 UTC | 20:10 UTC |
| 18:00 UTC | 15 days (360 hours) | 01:45 UTC (next day) | 02:10 UTC (next day) |
|---|---|---|---|


Note: Interim 1-hour inits (01:00--05:00, 07:00--11:00, 13:00--17:00, 19:00--23:00
UTC) deliver forecasts for surface and station variables, targeting delivery at
\<init-time\> + 7 hours and 10 minutes for GCS and \<init-time\> + 7 hours and 25 minutes for BigQuery \& Earth Engine.

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## WeatherNext 2

WeatherNext 2 runs 4 times daily (00, 06, 12, 18 UTC) across all 64 ensemble
members and the ensemble mean:

| Forecast Run (Init Time UTC) | Google Cloud Storage (Zarr) | BigQuery | Earth Engine |
| 00:00 UTC | 06:50 UTC | 07:30 UTC | 07:30 UTC |
| 06:00 UTC | 12:50 UTC | 13:30 UTC | 13:30 UTC |
| 12:00 UTC | 18:50 UTC | 19:30 UTC | 19:30 UTC |
| 18:00 UTC | 00:50 UTC (next day) | 01:30 UTC (next day) | 01:30 UTC (next day) |
|---|---|---|---|

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## Observational datasets

Live near-real-time updates for observational datasets are published on Google
Cloud Storage (Zarr):

| Dataset | Temporal Cadence | Update Frequency | Target Latency |
| [SatWeave](https://developers.google.com/weathernext/guides/satweave.md.txt) | 1 hour (live) · 30 minutes (2016--2025 archive) | Every hour | \~1 hour |
| [PARDIG-NRT](https://developers.google.com/weathernext/guides/pardig.md.txt) | 15 minutes | Every 6 hours | \~5 hours average (\~2-8 hours effective latency) |
|---|---|---|---|

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## Monitoring and support

To check current service health or report data delivery delays, refer to [How to
get help](https://developers.google.com/weathernext/support) or email
[weathernext@google.com](mailto:weathernext@google.com).