The National Oceanic and Atmospheric Administration has issued a Thursday night northern lights forecast indicating that a Kp index of 4 to 5 will bring the aurora borealis to parts of 10 northern U.S. states. Driven by minor geomagnetic storm conditions from a coronal mass ejection, stargazers in regions from Washington to Maine can expect visibility late into the evening.
Geomagnetic Drivers and the Kp Index Breakdown
Space weather monitoring by the National Oceanic and Atmospheric Administration points to a distinct uptick in auroral activity. Thursday night’s display is slated to hit a Kp index of 4 according to baseline agency updates, while simultaneous projections note conditions touching a Kp index of 5 on a scale of 9. This variance stems from the lingering influences of a recent coronal mass ejection—massive plumes of solar material escaping the sun’s outer atmosphere and interacting with Earth’s magnetosphere.
While solar activity hit a dramatic 500-year peak back in 2024 as the sun pushed through the maximum phase of its solar cycle, current trends indicate overall auroral frequencies are beginning to taper off. Even so, tonight’s minor geomagnetic activity provides a sharp mid-week window for observers situated far from equatorial latitudes. Forecasters expect geomagnetic calm to return quickly over the weekend, with the Kp index projected to drop down to 2 by Saturday night.
Where to Look: The 10-State Viewline
Geography dictates success when tracking lower-latitude auroras. Alaskans will secure the highest likelihood of a vibrant display across the state, but several contiguous U.S. states sit squarely within the projected viewline. According to NOAA forecasts compiled across regional updates, the southern migration of the aurora borealis places parts of Washington, Idaho, Montana, North Dakota, South Dakota, Minnesota, Wisconsin, and Michigan within range.
| State / Region | Likelihood & Visibility Factors |
|---|---|
| Alaska | High likelihood across most of the state; optimal viewing conditions. |
| Montana & North Dakota | Much of both states sit under favorable projection zones. |
| Minnesota | Northern half of the state holds a decent chance of visibility. |
| Washington, Idaho, South Dakota, Wisconsin, Michigan | Northern portions of these states track minor visibility margins. |
| Maine & New York (Border Regions) | Peripheral viewing zones depending on localized Kp index fluctuations. |
Optimization Tactics for Stargazers and Digital Photographers
Catching the aurora requires minimizing atmospheric and artificial interference. NOAA advises viewers to head out during peak visibility windows, typically between 10 p.m. and 2 a.m. local time. Finding an elevated vantage point completely devoid of light pollution remains essential for tracking subtle green and purple arcs on the horizon.
Capturing the phenomenon digitally demands specific hardware configurations. Travel photographers speaking with National Geographic recommend mounting cameras on a sturdy tripod to eliminate motion blur during extended exposures. Creators should pair a wide-angle lens with a low aperture and a reduced shutter speed to pull in faint photons. For mobile device users, capturing the display on an iPhone or Android flagship requires enabling dedicated night mode, disabling the flash entirely, and shooting in RAW format to preserve dynamic range in the final image file.
