GribStream Blog
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.
On January 31, 2025, we added three GEFS-derived datasets to GribStream.
What is new
- GEFS Chem: ensemble-based atmospheric chemistry forecasts for aerosols and key pollutants.
- GEFS Wave Prob: probability of wave heights exceeding thresholds for marine risk planning.
- GEFS Atmos Mean: an ensemble-mean view of standard atmospheric variables.
What makes them useful
GEFS is designed to capture forecast uncertainty. These products add a probabilistic layer that is hard to get from a single deterministic model:
- Air quality and dispersion: use GEFS Chem to monitor pollutant spread and risk windows.
- Marine safety: wave exceedance probabilities help avoid rare but high-impact scenarios.
- Baseline guidance: the ensemble mean provides a stable forecast signal for planning and verification.
Model details
- Global 0.25 deg grid.
- Four daily cycles.
- GEFS Chem: up to 5 days.
- GEFS Wave Prob and GEFS Atmos Mean: up to 10 days.