{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2026-08-06-weathernext-open-source/","md":"https://postcutoff.com/e/2026-08-06-weathernext-open-source/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"2026-08-06-weathernext-open-source","date":"2026-08-06","date_precision":"day","short_title":"DeepMind open-sources WeatherNext 2 and WeatherNext Cyclones with a Nature paper showing ~1 extra day of hurricane warning","deck":null,"takeaway":null,"category":"science","category_label":"Science & math","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Result confirmed"]},"sources":[{"n":1,"title":"DeepMind: AI model achieves breakthrough in forecasting cyclones","url":"https://deepmind.google/blog/weathernext-ai-model-achieves-breakthrough-in-forecasting-cyclones/","type":"official","group":"primary","domain":"deepmind.google"},{"n":2,"title":"GitHub: google-deepmind/weathernext","url":"https://github.com/google-deepmind/weathernext","type":"code","group":"primary","domain":"github.com"},{"n":3,"title":"Google blog: WeatherNext 2 cyclones","url":"https://blog.google/innovation-and-ai/models-and-research/google-deepmind/weathernext-2-cyclones/","type":"official","group":"primary","domain":"blog.google"},{"n":4,"title":"Google blog: How AI is helping forecast cyclones (WeatherNext Q&A, Sept 1)","url":"https://blog.google/innovation-and-ai/models-and-research/google-deepmind/weathernext-extreme-weather-cyclone-predictions/","type":"official","group":"primary","domain":"blog.google"},{"n":5,"title":"Open Source For You: DeepMind open sources WeatherNext","url":"https://www.opensourceforu.com/2026/08/google-deepmind-weathernext-ai/","type":"press","group":"press","domain":"opensourceforu.com"},{"n":6,"title":"Local 10: The AI hurricane model that continues to blow away the competition (Sept 10, 2026)","url":"https://www.local10.com/weather/hurricane/2026/09/10/the-ai-hurricane-model-that-continues-to-blow-away-the-competition/","type":"press","group":"press","domain":"local10.com"},{"n":7,"title":"CNN (via KSL): Why the National Hurricane Center bet big on AI to forecast Isaias (Oct 8)","url":"https://www.ksl.com/article/51634059/why-the-national-hurricane-center-bet-big-on-ai-to-forecast-isaias","type":"press","group":"press","domain":"ksl.com"},{"n":8,"title":"CNN original: Why the National Hurricane Center bet big on AI to forecast Isaias","url":"https://www.cnn.com/2026/10/08/weather/hurricane-isaias-ai-models-google","type":"press","group":"press","domain":"cnn.com"},{"n":9,"title":"FOX Weather live updates: Isaias landfall near Destin, Norcross on DeepMind forecast (Oct 9–10)","url":"https://www.foxweather.com/live-news/live-updates-hurricane-isaias-threatens-the-gulf-coast-with-dangerous-landfall-expected-tonight","type":"press","group":"press","domain":"foxweather.com"},{"n":10,"title":"Gizmodo: Tropical Storm Isaias is expected to slam the Gulf Coast as a hurricane this weekend (Oct 8)","url":"https://gizmodo.com/tropical-storm-isaias-is-expected-to-slam-the-gulf-coast-as-a-hurricane-this-weekend-2000822829","type":"press","group":"press","domain":"gizmodo.com"},{"n":11,"title":"NPR: How AI is transforming hurricane forecasts (Isaias, Oct 26)","url":"https://www.npr.org/2026/10/26/nx-s1-6012820/ai-hurricane-forecast-google-deepmind-isaias","type":"press","group":"press","domain":"npr.org"}],"official":4,"filed":"2026-09-29","updated":"2026-10-26","orgs":["Google DeepMind","Google Research"],"title":"DeepMind open-sources WeatherNext 2 and WeatherNext Cyclones with a Nature paper showing ~1 extra day of hurricane warning","summary":"On 6 Aug 2026 Google DeepMind released weights and code for WeatherNext Cyclones, WeatherNext 2 and WeatherNext 2-mini under commercial-use-friendly licences, alongside a Nature paper showing its cyclone model gives more than a day of extra lead time on track, intensity and size forecasts.","key_facts":["Three-day WeatherNext Cyclones forecast about as accurate as prior systems at two days: '>24 hours lead time advantage'","Released: WeatherNext Cyclones, WeatherNext 2, WeatherNext 2-mini (runs on a single TPU / free Colab)","Licences: Apache 2.0 for code/notebooks, CC BY 4.0 for other materials — first DeepMind weather weights allowing commercial use","Paper in Nature (s41586-026-10953-2)","Partners: US National Hurricane Center, CIRA, UK Met Office; helped NHC forecast Hurricane Melissa's 2025 rapid intensification","Google blog Q&A (Sept 1) with DeepMind's Ferran Alet: WeatherNext was trained on 50 years of historical weather data and runs on a single TPU; high-confidence AI forecasts helped the US National Hurricane Center warn of Hurricane Melissa's rapid intensification from Category 1 to Category 5","2026 season (Local 10 Miami, Sept 10): DeepMind's model was the most accurate hurricane track model of 2026 through early September in both the Atlantic and Pacific, beating NHC's official track forecasts by up to ~30% at five days, the second year in a row it topped NHC at most lead times","Hurricane Isaias (Oct 7–10, 2026; the latest first Atlantic hurricane of a season on record): AI models, including WeatherNext Cyclones, which NHC uses operationally, favoured an eastern landfall on the western Florida Panhandle (Cat 1, early Sat Oct 10), while physics-based models favoured Mississippi/Louisiana; NHC's official track split the difference (Gizmodo, Oct 8). CNN (Andrew Freedman, Oct 8): NHC shaped its forecasts to closely match Google DeepMind's AI model (named in the syndicated text as WeatherNext 3) rather than the European and GFS physics models, forecasting Category 2 from the first advisory; NHC director Michael Brennan: 'The AI models have shown more consistency from one model run to the next'","Isaias outcome: landfall near Destin, Florida (western Panhandle), 9:30 p.m. ET Fri Oct 9 as a Category 2 hurricane with 105 mph winds; at least 4 deaths in Florida and Alabama (FOX Weather live blog). FOX Weather hurricane specialist Bryan Norcross: 'The Google DeepMind AI forecast was once again the best'. The AI track (right side of the cone, farther east) verified; intensity was slightly overdone (over 60% of DeepMind ensemble members made Isaias a major hurricane, per secondary reports)","NPR (Oct 26) Isaias post-mortem: conventional models initially sent the storm toward southeastern Louisiana while DeepMind's model 'called it right out of the gate' (western Florida Panhandle). NHC director Michael Brennan: the model beat others on track but did worse than NHC's blended forecast on intensity, and NHC gives DeepMind regular feedback. Meteorologist Michael Lowry: 'by far and away, the best performing computer model that we've ever seen. Period.' Brian McNoldy (U. Miami) on the black-box problem: 'It makes us a little uncomfortable, because we like to know why you're getting the right answer'"],"key_numbers":[],"tags":["weather","climate","open-weights","nature","cyclones"],"science":{"field":"climate-weather","subfield":"tropical cyclone forecasting","problem":"Forecasting tropical-cyclone track, intensity and size","result":"WeatherNext Cyclones' 3-day forecasts are about as accurate as prior systems' 2-day forecasts (>24 h extra lead time); weights released for commercial use.","open_since":"","ai_system":["WeatherNext Cyclones","WeatherNext 2"],"human_role":"Human-designed models; used operationally by forecasters at the US National Hurricane Center","verification":{"key":"peer-review","label":"Peer-reviewed","text":"Peer-reviewed in Nature (2026); operational evaluation with NHC"},"status":"confirmed","shock":""},"body_md":"## What happened\n\nDeepMind published open weights and code for its WeatherNext family and a peer-reviewed Nature paper on WeatherNext Cyclones, co-developed with Google Research and operational forecasters.\n\n## Why it matters\n\nAn extra day of hurricane warning is roughly a decade of conventional meteorological progress; releasing the weights for commercial use lets national weather services and companies run state-of-the-art AI forecasting themselves.","disputed":[],"related":[{"id":"2026-09-03-weathernext-3","url":"https://postcutoff.com/e/2026-09-03-weathernext-3/","date":"2026-09-03","date_precision":"day","short_title":"Google DeepMind's WeatherNext 3 learns from live satellite data","deck":"Hourly 5 km global forecasts and up to 60% better precipitation skill","takeaway":"It is a step from AI emulating weather simulators to AI forecasting from raw observations, with global 5 km detail that regions without supercomputing budgets have lacked.","category":"science","category_label":"Science & math","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Result confirmed"]},"sources":5,"official":4,"filed":"2026-09-29","updated":"2026-10-07","orgs":["Google DeepMind","Google Research"]}],"people":[],"posts":[],"videos":[],"models":[],"changes":[{"date":"2026-10-26","type":"edit","text":"Added NPR's Isaias post-mortem (track vs intensity, NHC feedback loop, forecasters' black-box unease)"},{"date":"2026-10-11","type":"edit","text":"Hurricane Isaias outcome (landfall near Destin, Cat 2; AI track verified), CNN Oct 8 article found and summarised"},{"date":"2026-10-10","type":"edit","text":"Added 2026 season track accuracy (Local 10) and the Hurricane Isaias AI-vs-physics landfall split (Gizmodo)"},{"date":"2026-09-30","type":"edit","text":"Added Google's Sept 1 WeatherNext cyclone Q&A"},{"date":"2026-09-29","type":"edit","text":"Added science block (science & math tab)"},{"date":"2026-09-29","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-09-29","run":null,"sources_read":null,"updated":"2026-10-26","human_review":null,"version":{"date":"2026-10-27"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":98,"in_training_data":false},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":37,"in_training_data":false},{"model_id":"gemini-4-hydrogen","name":"Gemini 4 Hydrogen","cutoff":"2026-03","days_after":128,"in_training_data":false},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":67,"in_training_data":false}],"short_url":null}