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NOAA predicts G1 storm, bright auroras across US Saturday

4/26/2026

26 2 Full Breakdown

Summary

Story summary

NOAA forecasts a G1 geomagnetic storm on Saturday night April 25 2026, triggered by a coronal mass ejection from M1-class solar flares on April 23 2026 that could make the northern lights visible in the United States.
The peak Kp index is expected to reach 4.67, producing brighter auroras.
Visibility is strongest in Alaska, Washington, Idaho, Montana, North Dakota and Minnesota but drops on Sunday night April 26 2026 when the Kp index falls to 3.

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Story summary

NOAA forecasts a G1 geomagnetic storm on Saturday night April 25 2026, triggered by a coronal mass ejection from M1-class solar flares on April 23 2026 that could make the northern lights visible in the United States.
The peak Kp index is expected to reach 4.67, producing brighter auroras.
Visibility is strongest in Alaska, Washington, Idaho, Montana, North Dakota and Minnesota but drops on Sunday night April 26 2026 when the Kp index falls to 3.