Night often arrives quietly across the northern half of the United States. Streets dim, clouds drift apart, and above the darkening horizon the sky opens into its familiar expanse of stars. Yet sometimes, on evenings shaped not only by weather but by the restless breath of the Sun, something more may appear—soft ribbons of green and violet rising where darkness meets the northern edge of the world.
Tonight carries such a possibility.
Forecasters at the National Oceanic and Atmospheric Administration have issued a watch for a minor geomagnetic storm, triggered by a stream of charged solar particles moving toward Earth from a coronal hole on the Sun’s surface. As those particles interact with Earth’s magnetic field, they can funnel toward the poles, colliding with gases in the upper atmosphere and producing the shifting lights known as the aurora borealis.
Because of this solar activity, skywatchers across parts of the northern United States may have a chance to glimpse the phenomenon more commonly seen in Arctic regions. The states with the best chances tonight include Alaska, Washington, Idaho, Montana, North Dakota, South Dakota, Minnesota, Wisconsin, Michigan, and Maine—places where the northern horizon lies closest to the auroral oval that circles Earth’s magnetic pole.
If the geomagnetic disturbance strengthens even slightly, the glow could stretch farther south, brushing the skies of additional states such as Oregon, Nebraska, Iowa, Illinois, Ohio, New York, Vermont, or New Hampshire. Still, the aurora is famously unpredictable, appearing in brief arcs or waves that may last minutes before fading back into darkness.
For those hoping to witness the display, the quiet rituals of stargazing apply. Darkness matters. The farther one travels from city lights, the clearer the northern horizon becomes. Patience also helps: observers are often advised to look between about 10 p.m. and 2 a.m., when geomagnetic activity and night’s deepest darkness tend to overlap.
Even then, the lights may appear subtly at first—perhaps a faint green glow low in the sky, or a pale curtain drifting slowly above the trees. Cameras and smartphones using night-mode settings can sometimes capture colors more vividly than the human eye, revealing the soft motion of charged particles arriving from ninety million miles away.
Moments like these are reminders that the sky is not still but alive with invisible forces. Solar winds move outward through the solar system, Earth’s magnetic field bends and flexes in response, and far above the atmosphere those encounters translate into shifting color.
Tonight, if skies remain clear and the solar wind holds steady, residents across parts of the northern United States may find that the horizon carries more than stars—perhaps a quiet shimmer of light drifting across the dark.
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Sources (Media Names Only)
People BBC Sky at Night Magazine NOAA Space Weather Prediction Center Tempo