Latest DESI upgrade includes next-generation model data
GSL has released its latest update to the powerful Dynamic Ensemble Scenarios for Impact-Based Decision Support (DESI) tool on both the GSL experimental product development server and the National Weather Service (NWS) cloud platform. This milestone occurs as NWS continues to expand its use of DESI at its Weather Forecast Offices to develop weather forecasts and produce hazardous weather briefings for partners and the public.

GSL has released its latest update to the powerful Dynamic Ensemble Scenarios for Impact-Based Decision Support (DESI) tool on both the GSL experimental product development server and the National Weather Service (NWS) cloud platform. This milestone occurs as NWS continues to expand its use of DESI at its Weather Forecast Offices to develop weather forecasts and produce hazardous weather briefings for partners and the public.
This release (Version 3.4, completed in May 2025) marks the first time that data from the experimental Rapid Refresh Forecast System (RRFS) and Rapid Ensemble Forecast System (REFS) are accessible in DESI. RRFS, the next-generation, rapidly-updating, high-resolution forecast system under development by GSL and partners for several years, runs hourly and produces high-resolution forecasts over all of North America. It is NOAA’s first convection-allowing model to cover the entire continent and its island territories. REFS, the ensemble version of RRFS, covers the continental U.S, Alaska, Hawaii, and Puerto Rico and runs every six hours.
With these systems being integrated into DESI, users now also have access to new RRFS forecast fields, including Hourly Wildfire Potential and surface and vertically-integrated smoke and dust forecasts. Currently, the RRFS and REFS products are available on DESI’s experimental GSL platform.

DESI is designed to allow forecasters to explore large amounts of weather data and generate forecasts as quickly and efficiently as possible. The new additions in DESI 3.4 provide users with even more opportunities to evaluate and interrogate data, honing in on specific risks or other forecast criteria. This release also includes performance upgrades, allowing, in some cases, for probabilistic forecasts and timing calculations to complete over 8 times faster than in the previous releases.
These upgrades come as DESI reaches several major milestones, including being leveraged by NWS during the 2025 operational field evaluation of RRFS Version 1.0 and the evaluation of experimental hurricane forecasting tools in the Hurricane and Ocean Testbed.
As GSL and NWS work toward a transition plan to integrate DESI into full, nationwide operations, stay tuned to GSL for future news about further upgrades and new functionality.

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Lead research and directed development through the transition of environmental data, models, products, tools, and services to support commerce, protect life and property, and promote a scientifically literate public.
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Organizational Excellence, Earth System Prediction, Advanced Technologies, and Decision Support are the foundation to achieving the GSL Grand Challenge: Deliver actionable global storm-scale prediction and environmental information through advanced technologies to serve society.
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