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Geomagnetic Storms May Illuminate Northern Skies This Weekend

9/21/2025

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Summary

Story summary

Northern U.S. states may experience northern lights this weekend due to a geomagnetic storm forecasted by NOAA.
A Kp index of three is expected Saturday night, potentially rising to four on Sunday and five early Monday.
Ideal viewing locations include northern Canada, Alaska, Minnesota, and South Dakota.
The fall equinox on September 22 enhances auroral activity through Earth's magnetic field alignment.
Increased auroras during equinoxes require strong solar activity, with the upcoming solar maximum likely causing more frequent geomagnetic storms.

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Story summary

Northern U.S. states may experience northern lights this weekend due to a geomagnetic storm forecasted by NOAA.
A Kp index of three is expected Saturday night, potentially rising to four on Sunday and five early Monday.
Ideal viewing locations include northern Canada, Alaska, Minnesota, and South Dakota.
The fall equinox on September 22 enhances auroral activity through Earth's magnetic field alignment.
Increased auroras during equinoxes require strong solar activity, with the upcoming solar maximum likely causing more frequent geomagnetic storms.