NOAA Forecasts Kp 4 Aurora Over Northern U.S. and Alaska as Minor Solar Storms Build

Q: As solar activity peaks through 2027, will aurora sightings become common in the northern United States?

Aurora sightings are likely to be more frequent than usual in the northern United States during this active solar period, but not common in the everyday sense. The reason is that stronger solar activity brings more coronal mass ejections and fast solar wind streams, which trigger geomagnetic storms. When those storms reach G1 or higher, the auroral oval expands southward, improving the odds for northern-tier states such as Washington, Idaho, Montana, North Dakota, Minnesota, Wisconsin, Michigan’s Upper Peninsula and northern New England. But frequency still depends on storm strength, cloud cover, darkness and light pollution. A forecast like Kp 4, such as NOAA issued for Sunday night, can sometimes make the aurora visible near the U.S.-Canada border, yet it does not mean routine or widespread sightings. More reliable lower-48 displays usually require stronger conditions, around Kp 5 or above. The broader outlook is favorable but time-limited. Solar Cycle 25 has been unusually active, and elevated aurora chances are expected to continue into 2026 and likely into 2027 as the cycle declines from its peak. That means more opportunities than during quiet solar years, including occasional displays farther south during stronger G2 to G4 storms. So for the northern U.S., auroras should become more frequent during this period, especially near the Canadian border, but they will still be event-driven rather than a regular occurrence. Alaska remains the place with consistently high odds.

3 articles · Updated · Forbes · Jul 5

NOAA said Sunday night could bring a low chance of northern lights visibility along the U.S.-Canada border and a high likelihood across much of Alaska.
A Kp index of 4 out of 9 is forecast, with a coronal mass ejection from Wednesday to Thursday expected to reach Earth and combine with fast solar winds from a coronal hole.
Those interactions can trigger minor geomagnetic storms that push aurora visibility farther south, including northern Washington, Idaho, Montana, North Dakota, Minnesota, Wisconsin and Michigan's Upper Peninsula.
NOAA says the best viewing window is typically 10 p.m. to 2 a.m., from dark northern-facing locations away from light pollution.