National Aeronautics and Space Administration

Goddard Space Flight Center

The GMAO Research Site

The Global Modeling and Assimilation Office (GMAO) supports NASA's Earth Science mission. Activities in Earth System modeling and data assimilation aim to maximize the impact of satellite observations on analyses and predictions of the atmosphere, ocean, land and cryosphere.

Science Snapshots

Science Snapshot Archive »

The Stratospheric Sudden Warming of March 2025 Abruptly Ended the NH Stratospheric Polar Vortex

A cold stratospheric polar region characterized most of the NH winter of 2024-2025, with a major final warming in early March. The GMAO's GEOS-FP and GEOS-S2S products were able to forecast and characterize the evolution of this SSW event.

GEOS-FP Excels At Predicting Presidents' Week Mid-Atlantic Snowfall

A large snowstorm struck the Mid-Atlantic just after Presidents' Day. While many NWP models had to shift their snowfall locations in the days leading up the event, GEOS-FP had the snowstorm correctly forecasted from the beginning.

Uncertainty Quantification for Air Quality Forecasting using Multiple Data Sources

GMAO scientists have continued their work on air quality forecasting by using various phases to lessen the level of uncertainty. See how these results can help improve forecasts and inform the public on dangerous air quality in advance.

GeoXO Promises NWP Modeling Breakthroughs Over Next Decade

New satellites released over the coming years as part of the GeoXO program will create vastly improved data observations, providing numerical weather prediction models with the information necessary to take tremendous strides forward.