Incoming cannibal solar storm could spark Labor Day northern lights show

northern lights appear as ribbons of purple and green light over Carp Lake, Michigan, USA — A pair of solar eruptions may combine into a powerful "cannibal CME," boosting chances for dazzling auroras over Labor Day. (Image credit: brett biggers / 500px via Getty Images)

Heads up aurora chasers! A powerful solar storm is on its way and could supercharge the skies with northern lights just in time for the Labor Day holiday.

A long-duration M2.7 flare erupted from sunspot Active Region 4199 on Aug. 30, launching a fast-moving, Earth-directed coronal mass ejection (CME). The CME is expected to reach Earth late on Sept. 1 into early Sept. 2 (UTC), according to the National Oceanic and Atmospheric Administration's (NOAA) Space Weather Prediction Center (SWPC).

Space weather physicist Tamitha Skov highlighted that there are actually two Earth-directed solar storms, with one possibly overtaking the other. "The NOAA model run includes the two Earth-directed #solarstorm launches. The larger one catches up with the smaller one just ahead of Earth so a precursor disturbance may indeed ramp up before the larger storm hits. Impact is expected by late September 1. G2+ conditions possible," Skov wrote on X. When one CME sweeps up another in this way, scientists call it a "cannibal CME" — a scenario that may be unfolding now.

gif animation shows the arrival of incoming CMEs — NOAA model showing two incoming CMEs. (Image credit: NOAA)

The U.K. Met Office echoed the alert, stating the auroral oval is expected to be "significantly enhanced" after the CME arrives, with displays possibly visible as far south as East Anglia, the Midlands, and Wales under clear skies. However, they caution that a waxing gibbous moon may hamper viewing.

NOAA classifies geomagnetic storms on a scale from G1 (minor) to G5 (extreme). G3 storms can bring auroras to mid-latitudes (around 50° geomagnetic latitude), which often translates to states like Oregon, Illinois, and New York in the U.S.

CMEs are massive bursts of plasma and magnetic field from the sun that can spark colorful auroras when they slam into Earth’s magnetic field. These storms can also disrupt satellites, radio communications, and even power grids during stronger events.

Aurora conditions are expected to remain elevated into Sept. 3, so even if clouds spoil the show one night, there could be more chances to catch the northern lights in the days ahead.

Stay tuned!

Daisy Dobrijevic joined Space.com in February 2022, having previously worked as a staff writer for All About Space magazine. She completed an editorial internship with BBC Sky at Night Magazine and worked at the National Space Centre, communicating space science to the public.

Daisy holds a PhD in plant physiology and a Master's in Environmental Science. Based in Nottingham, U.K., she covers all things space, with a special focus on solar activity and space weather. She also has a keen interest in astrotourism and is always on the lookout for the next northern lights adventure.

She will be a guest speaker aboard HX's Solar Eclipse Expedition in August 2026 and will join Hurtigruten as an onboard astronomer for a northern lights sailing in January 2027.