Weather May Have a 129-Day Ultimate Limit, but Useful Forecasts Are Far Shorter

A new peer-reviewed calculation places the atmosphere's ultimate internal predictability limit at 129 ± 7 days. The estimate suggests room for better long-range guidance, but it assumes perfect observations and models and does not demonstrate detailed four-month forecasts. Weather May Have a 129-Day Ultimate Limit, but Useful Forecasts Are Far Shorter