NWS tests Probabilistic HeatRisk with NBM, RTMA, and URMA data
NWS is accepting comments on a Probabilistic HeatRisk prototype through September 30, 2026, using NBM MaxT and MinT forecasts with RTMA and URMA analysis data.
GribStream Blog
Updates on data feeds, model launches, and product releases.
NBM v5.1 planned for October 2026: winter guidance and new coverage
NOAA and WPC presentations point to NBM v5.1 in October 2026, with 12-hour winter guidance, precipitation-type and percentile fixes, and new Southwest Pacific coverage.
AIFS v2 fields are now visible on GribStream
GribStream now exposes the newly available AIFS v2 selectors in AIFS Operational and AIFS Ensemble, including the 10 hPa stratospheric level and additional snow, cloud, soil, and geopotential fields.
NOAA schedules RRFS and REFS operations for August 31, 2026
NOAA/NWS has set August 31, 2026 at 12 UTC for operational RRFS and REFS, replacing NAM, SREF, HREF, most HiresW domains, and NAM MOS.
ECMWF IFS Cycle 50r1 is now live on GribStream
GribStream is now processing ECMWF IFS Cycle 50r1 in the existing IFS datasets, with the model boundary at the 06 UTC run on May 12, 2026.
NOAA AIGEFS ensemble forecasts are now available in GribStream
GribStream now serves NOAA's AIGEFS surface and pressure-level AI ensemble forecasts, alongside longer-history AIGFS access from the NOAA EAGLE public archive.
Solar panel generation forecasting with GribStream weather models
A new GribStream dashboard turns hourly shortwave radiation and temperature forecasts from GFS, HRRR, and NBM into a transparent solar PV generation forecast.
NOAA EAGLE now carries current AIGFS and AIGEFS forecasts in AWS
NOAA's EAGLE/Open Data bucket now contains current AIGFS deterministic and AIGEFS ensemble forecast data, improving access and retention prospects for AI global guidance.
NOAA schedules 15-minute GTGN turbulence nowcasts for June 29, 2026
NOAA plans to make GTGN operational on or about June 29, 2026, adding 15-minute CONUS turbulence nowcasts that blend GTG forecasts with aircraft, radar, lightning, and METAR observations.
RRFS on GribStream: pressure levels refreshed and 2D fields added
GribStream re-onboarded NOAA's experimental RRFS CONUS feeds, keeping rrfsprslev for pressure-level guidance and adding rrfs2dfld for surface, near-surface, cloud, radiation, precipitation, fire-weather, and storm-diagnostic fields.
NBM v5 is now operational on GribStream
NBM v5 is now flowing through the operational GribStream NBM dataset codes, with previous-version history preserved before the May 5 UTC cutover and NBM parallel datasets deprecated for NBM v5 production use.
NOAA CCPA 1-hour precipitation analysis is now on GribStream
GribStream now serves NOAA's one-hour Climatologically Calibrated Precipitation Analysis on the CONUS NDGD 2.5 km grid for verification, hydrology, event review, and model evaluation.
NOAA SPC HREF convective probability guidance is now on GribStream
GribStream now serves NOAA Storm Prediction Center HREF thunderstorm, lightning-density, hail, tornado, and severe-wind probability guidance for CONUS severe-weather workflows.
NOAA Ultraviolet Index forecasts are now on GribStream
GribStream now serves NOAA Ultraviolet Index forecast guidance for public-health, outdoor recreation, tourism, agriculture, and solar-exposure applications.
Taiwan CWA WRF 15 km western Pacific forecasts are coming to GribStream
GribStream is adding Taiwan CWA's regional WRF 15 km forecast for East Asia and the western Pacific, filling a regional model gap between global guidance and local Taiwan-scale products.
NOAA DAFS aviation icing and turbulence forecasts are now on GribStream
NOAA's short-range aviation icing and turbulence guidance is now available through GribStream for route screening, dispatch dashboards, and operational flight-planning tools.
NOAA AIGFS surface and pressure forecasts are now on GribStream
GribStream now serves NOAA/NCEP AIGFS surface and pressure-level GRIB2 forecasts through the API, with 0.25 degree global fields out to 384 hours.
Use GribStream from ChatGPT, Claude, and Gemini with MCP
The new GribStream MCP connector lets AI tools turn weather questions into validated API requests for datasets such as GFS, IFS, and NBM.
Public catalog endpoints now available
GribStream now exposes public catalog endpoints to list datasets, inspect parameter metadata, and resolve shared cross-dataset selectors.
ECMWF will stop experimental GraphCast and FourCastNet charts when AIFS v2 launches
ECMWF's IFS 50r1 and AIFS v2 implementation pages say its experimental Aurora, FourCastNet, GraphCast, and Pangu-Weather chart models will stop when the May 12, 2026 upgrade goes live.
P-ETSS v1.5 proposal adds blended GFS/GEFS surge guidance and more GRIB2 delivery
NWS proposed P-ETSS v1.5 for the 2026-2027 winter season, adding blended GFS/GEFS/GEPS storm-surge guidance and expanding Puerto Rico/USVI GRIB2 dissemination.
NOAA proposes GFS v17 for October 2026: 9 km coupled upgrade and product removals
NWS is seeking comments on a proposed GFS/GDAS v17 upgrade targeted for October 2026, with a 9 km coupled forecast system, major GDAS changes, and several legacy products slated for removal.
NOAA proposes retiring NFCENS wave ensemble products
NWS is seeking comments through May 14, 2026 on retiring all Combined NCEP/FNMOC Wave Ensemble products, pointing users toward GEFS wave guidance and NBM significant wave height.
NOAA adds AI GFS hurricane-track products to ens_tracker
NCEP added AIGFS, AIGEFS, and HGEFS tropical-cyclone track products to ens_tracker on April 8, 2026, with new NOMADS paths and a corrected GFS folder layout.
ECMWF confirmed the May 12, 2026 IFS Cycle 50r1 and AIFS v2 upgrade
ECMWF implemented IFS Cycle 50r1, AIFS Single v2, and AIFS ENS v2 from the 06 UTC run on May 12, 2026, with same-day model, stream, wave, and level changes to check.
GEFS v12.3.18 fixes missing wave-station ensemble stats on NOMADS
NWS says GEFS v12.3.18 restores missing spread and probability ensemble statistics in the NOMADS wave-station products, with the fix effective on or about February 24, 2026.
NBM v5.0 goes live April 15, 2026: what to check before cutover
Historical NBM v5.0 implementation-date note, updated now that NBM v5 is operational on GribStream under the permanent NBM dataset codes.
CPC proposes moving UVI forecasts 3 hours later as GCAFS replaces GEFS aerosols
CPC is proposing to move UVI forecast delivery from 1830Z to 2130Z because GCAFS aerosol guidance would arrive 3 hours later than the current GEFS aerosol inputs.
DAFS v1.0 is operational: HRRR-based icing and turbulence replace legacy RAP products
NCEP implemented DAFS v1.0 on March 30, 2026, adding 3 km HRRR-based IFI v2.0 and GTG v4.0 aviation products on NOMADS while retiring older RAP-based files.
NBM v5 parallel datasets now available
Historical NBM v5 parallel launch note, updated now that NBM v5 is operational on GribStream under the permanent NBM dataset codes.
NOAA NAM datasets now available
GribStream now supports NOAA NAM awphys, awip12, conusnest.hiresf, and goes218 for CONUS, with history back to September 16, 2021.
RTOFS v3.0 proposal: UFS/MOM6/CICE6 and GRIB2 filename changes
NWS proposed RTOFS v3.0, moving the ocean system toward UFS/MOM6/CICE6 while keeping GRIB2 output on NOMADS with renamed GRIB2 files.
NOAA CDAS to CORe in March 2026: what GribStream users should expect
NOAA is replacing CDAS with CORe on March 18, 2026. CORe remains public GRIB2, and if NOAA publishes an AWS mirror, GribStream expects to support it quickly.
HAFS v2.2 proposal adds 10 m wind gust to GRIB2 hurricane products
NWS proposed HAFS v2.2 with UFS, physics, ocean, data assimilation, and tracker updates, plus one product change: 10 m wind gust added to GRIB2 output.
ECMWF IFS Cycle 50r2: full GRIB2 transition and what to test now
ECMWF says IFS Cycle 50r2 will move all parameters to GRIB2. Here is the latest timeline, migration details, and practical checks for weather-data pipelines.
CDAS1 climate assimilation fields now available
GribStream now supports NOAA CDAS1 (Climate Data Assimilation System): global climate-oriented assimilation fields on a 1.0 deg grid with 0-9 hour lead times.
GDAS global analysis fields now available
GribStream now supports NOAA GDAS (Global Data Assimilation System): global analysis-first fields on a 0.25 deg grid with 0-9 hour lead times.
NBM OCONUS core grids now available: Alaska, Hawaii, Puerto Rico, Guam, and Oceanic
GribStream expanded NOAA's National Blend of Models (NBM) beyond CONUS with core grids for Alaska, Hawaii, Puerto Rico, Guam, plus the Oceanic domain.
NWPS v1.5 proposal adds GRIB2 runup, rip-current, and inlet-current products
NWS proposed NWPS v1.5.0 with unstructured meshes, expanded runup and rip-current guidance, and additional GRIB2 fields for coastal wave workflows.
RTMA Rapid Update (15-minute) CONUS actuals now available
GribStream added NOAA RTMA Rapid Update (rtma2p5_ru): 15-minute near-real-time surface analyses on the 2.5 km CONUS NDFD grid.
HRRR sub-hourly (15-minute) surface fields now available
GribStream added NOAA HRRR sub-hourly surface output (wrfsubhf) with 15-minute valid times out to 18 hours for intraday workflows.
NOAA tests GTGN: a 15-minute turbulence nowcast built on HRRR and observations
NOAA's Aviation Weather Center is seeking feedback on experimental GTGN, a 15-minute turbulence nowcast that blends GTG short-term forecasts with PIREPs, EDR reports, radar-derived signals, lightning, and METAR data over the HRRR CONUS domain.
NOAA proposes replacing GEFS aerosol products with GCAFS v1.0
NOAA/NCEP is soliciting comments on replacing GEFS v12 aerosol products with the Global Chemistry and Aerosol Forecast System (GCAFS) v1.0, including new cadence, new analyses (GCDAS), and updated aerosol modeling and assimilation.
NOAA makes the AI GFS family operational (AIGFS, AIGEFS, HGEFS)
NCEP announced operational rollout of AIGFS, AIGEFS, and HGEFS effective Dec 17, 2025 (12Z), delivering GraphCast-based deterministic and ensemble forecasts on NOMADS.
ECMWF opens the full Real-time Catalogue to all users
ECMWF opened its full Real-time Catalogue under CC BY 4.0 on Oct 1, 2025. Here is what changed, what still depends on delivery channels, and how GribStream users should read the news.
ECMWF IFS Cycle 50r1 upgrade targets early 2026 operations
ECMWF Newsletter 185 details IFS Cycle 50r1, a coupled ocean and sea-ice upgrade with NEMO4-SI3, assimilation changes, and major compute savings, planned for early 2026 operations.
URMA and RTMA now available: hourly actuals alongside forecasts
GribStream now serves URMA and RTMA so you can use near-real-time and verified hourly analyses next to your forecasts.
NBM fix restores tropical 10 m wind grids when NHC data are missing
NWS updated NBM tropical wind processing so missing NHC 10 m wind grids are replaced with deterministic 10 m wind fields, starting Sept 2, 2025 at 13Z.
RTMA v2.10.10 minor upgrade adds FAA station KJKA
NWS updated RTMA to v2.10.10 on Aug 26, 2025 (18Z) to add FAA station KJKA to the station list.
LAMP/GLMP v2.7 upgrade adds new flight-category guidance and visibility updates
NWS announced LAMP/GLMP v2.7 effective Sep 16, 2025, adding new flight-category bulletins, updated visibility thresholds, new station guidance, and an Alaska ceiling fix, with an Oct 9 update.
ECMWF AIFS operational and ensemble now on GribStream
AIFS operational and ensemble datasets are live on GribStream, providing AI-based global forecasts with deterministic and probabilistic outputs through stable dataset codes.
NBM percentile thinning proposed for Spring 2026
NWS proposes reducing NBM percentile output to 5th-95th (step of 5) plus min/max, to manage data volume as the blend adds new probabilistic fields.
GEFS aerosol 06/18Z cycle discontinuation proposed for 2026
NWS proposes ending the 06Z/18Z GEFS aerosol component forecasts by April 1, 2026, while keeping the 00Z/12Z aerosol cycles and all non-aerosol GEFS members unchanged.
SREF termination proposal: NOAA suggests GEFS as the replacement
NWS seeks comments on retiring the Short Range Ensemble Forecast System (SREF) and recommends GEFS as the replacement as it transitions to UFS-supported cores.
RRFS and RRFS Ensemble now supported
GribStream now serves NOAA's RRFS deterministic and 5-member ensemble datasets at convection-allowing resolution.
NBM v5.0 proposed for April 2026: major QPF, snow, and AI-input changes
Historical NBM v5.0 proposal note, updated now that NBM v5 is operational on GribStream under the permanent NBM dataset codes.
ECMWF takes AIFS-ENS operational as ensemble AI forecasts
ECMWF moved AIFS ENS v1 into operations on July 1, 2025, running a 51-member AI ensemble alongside the physics-based IFS ensemble.
RRFS proposed to replace NAM, HiresW, HREF, and NARRE in early 2026
NWS proposes retiring several legacy regional models in favor of the Rapid Refresh Forecast System (RRFS) and REFS, with a comment period through July 26, 2025.
Full GEFS ensemble members now available
GribStream now serves all GEFS ensemble members, not just the mean, enabling true probabilistic workflows.
ECMWF IFS ensemble and wave ensemble now available
IFS Enfo and IFS Waef are now on GribStream, providing 51-member ensembles for atmosphere and wave guidance.
ECMWF IFS deterministic wave model now available
GribStream now serves ECMWF IFS Wave deterministic forecasts for global ocean wave conditions.
ECMWF IFS operational now available
GribStream now serves ECMWF IFS Operational (HRES) with 0.25 deg global output and 15-day horizons.
Query forecasts like a database
GribStream expanded into a searchable weather archive with expressions, as-of model-run cutoffs, and richer demos.
Quickstart guide: expressions, filters, and as-of queries
A practical GribStream quickstart for choosing /timeseries or /runs, using asOf model-run cutoffs, adding expressions and filters, and wiring weather data into dashboards or pipelines.
How to access the GribStream API
A quick FAQ on where to access the API, create a token, and start making requests.
HRRR corn growth simulation demo (PTU + stress modeling)
A new HRRR-driven demo simulates corn growth using PTU, ET0, and stress factors, powered by expression-based queries.
NBM v4.3 upgrade goes live May 20, 2025
NWS announced NBM v4.3 with improved tropical cyclone wind feature-matching and updated SPC probabilistic severe products, effective May 20, 2025 at 12Z.
NBM snow accumulation demo for ski resorts
An NBM-based demo tracks snow and precipitation at ski resorts across North America.
Browse and compare NOAA model data with the demo dashboard
A new embedded dashboard lets you query the API directly, compare models, and explore parameters interactively.
URMA Great Lakes change: GLERL pseudo-observations disabled in obsproc v1.2.3
NOAA/NCEP disabled GLERL pseudo-observations in URMA over the Great Lakes as part of an obsproc v1.2.3 upgrade, citing low wind-speed bias impacting NBM guidance. Effective on or about March 24, 2025.
NOAA CFS models now available on GribStream
GribStream now supports the Climate Forecast System (CFS) with PGBF, FLXF, OCNF, and IPVF products back to 2018.
GEFS Chem, Wave Prob, and Atmos Mean now available
GribStream added GEFS Chem, GEFS Wave Prob, and GEFS Atmos Mean datasets for air quality, wave risk, and mean guidance.
Pricing update: Pro plans now include double the quota
GribStream doubled Pro plan quota while keeping prices steady and reduced coordinate bundle sizes for smaller requests.
Query sparse times with timesList
The API now supports timesList so you can request specific timestamps without pulling entire hourly ranges.
HRRR model now available
GribStream added NOAA's HRRR with 3 km resolution, hourly updates, and history back to 2014.
OpenAPI spec and Swagger UI now available
GribStream now provides an OpenAPI spec and Swagger UI so you can generate clients and explore endpoints quickly.
RAP model support and Skew-T examples
GribStream added NOAA RAP support and published a Python Skew-T log-P example.
GribStream: historical weather forecast API
A short overview of GribStream as a SaaS API for historical weather forecasts.
Product ideas and feedback thread
An open thread inviting ideas and feedback on future GribStream features.
Launching on Product Hunt
GribStream launched on Product Hunt and shared the announcement with the community.
API documentation published
GribStream documentation is now live for getting started and exploring endpoints.
GFS model now available
GribStream added the Global Forecast System (GFS) with historical forecasts and a demo viewer.
Introducing GribStream
Introducing GribStream: a fast API for historical weather forecasts with as-of model-run cutoffs and bulk extraction.