Why do aurora forecasts improve closer to the event?

Answer: More near-Earth data arrives

Local weather stops mattering — Wrong. Local weather always matters for viewing. A last-minute aurora forecast may become more accurate about space weather, but if clouds roll in, your viewing chances can still collapse.

The Sun gets easier to control — Wrong. Scientists can observe and model the Sun, but they cannot control it. Forecasts improve because the data gets better, not because the Sun becomes more obedient.

More near-Earth data arrives ✓ — Correct! Early forecasts rely more on seeing what leaves the Sun and estimating how it will travel. But once that solar wind gets closer to Earth, spacecraft near Earth can measure its speed, density, and magnetic field more directly. That gives forecasters much better information about whether the event is likely to produce strong auroras and when the peak may happen.