Another round of geomagnetic activity means the Northern Lights might once again make a surprise appearance tonight, June 3, in several American states. After two powerful coronal mass ejections (CMEs) slammed into Earth’s magnetic field over the weekend, auroras lit up skies around the world, and the show’s not over just yet.
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Forecasters at the U.K. Met Office say there’s still a slight chance of a strong geomagnetic storm tonight, though minor to moderate conditions is more likely. The NOAA Space Weather Prediction Center expects the Kp index (a measurement of geomagnetic activity) to peak at 4.67—strong enough to potentially push auroras farther south than usual.
Alaska remains the best bet for skywatchers in the U.S., but if geomagnetic activity ramps up again, Northern Lights could stretch as far south as Illinois and Oregon. NOAA lists 13 U.S. states that are either fully or partially within the auroral viewing zone. Minnesota, Wisconsin, Montana and North Dakota are the most promising.
But don't make any major travel plans: auroras are famously unpredictable. They can flare unexpectedly or fade without a trace. Cloud cover, light pollution and local weather will also play a role. Check NOAA’s 3-day aurora forecast for real-time updates before you head out.
Bottom line? If you’re anywhere near the auroral oval tonight, keep an eye on the sky (and, ideally, seek out a north-facing vantage point far from urban light pollution for the best view). Even if the odds are slim, the payoff could be a jaw-dropping celestial show!
13 U.S. states that could see auroras tonight
1. Alaska
2. Minnesota
3. North Dakota
4. Montana
5. Wisconsin
6. Michigan (Upper Peninsula)
7. South Dakota
8. Maine
9. Vermont
10. New Hampshire
11. Idaho
12. Washington
13. Oregon