3-Day Kp Index Forecast
Predicted geomagnetic activity for the next 72 hours, based on NOAA SWPC data.
Peak Forecast Kp
5.33
Wed, 22 Jul 2026 18:00:00 GMT
Storm Periods
3
Geomagnetic storm expected
Data Points
81
3-hour intervals
Kp Index Timeline
How to Read This Forecast
The Kp index measures geomagnetic activity on a scale from 0 to 9. Higher values mean the auroral oval expands toward the equator, so the aurora becomes visible from lower latitudes. A Kp of 5 or above is classified as a geomagnetic storm (G1 and up).
Bars on the chart are shaded by status: solid bars are observed values, lighter bars are estimated, and the faintest bars are predictions. The orange dashed line marks the G1 storm threshold.
Source: NOAA SWPC · Updated every 3 hours