What's Happening?

The northern lights, or auroras, may be visible across 18 U.S. states tonight due to geomagnetic storm activity. According to NOAA's forecast, several coronal mass ejections (CMEs) are expected to impact Earth, potentially triggering minor to moderate geomagnetic storms. The states where auroras might be visible include Alaska, North Dakota, Minnesota, Montana, Washington, Idaho, Wisconsin, South Dakota, Michigan, Maine, Vermont, New Hampshire, Oregon, Wyoming, Iowa, Nebraska, New York, and Illinois. The geomagnetic activity is forecast to ramp up through March 19-21, with a G2 (moderate) geomagnetic storm watch issued by NOAA. The arrival of high-speed solar wind later this week could sustain aurora visibility into March 21, even if earlier CME impacts are weaker or delayed.

Why It's Important?

Residents in the northern U.S. states may experience increased visibility of the auroras, which are typically seen closer to the poles. The geomagnetic storms could push the northern lights farther south than usual, offering a rare viewing opportunity. However, the visibility of auroras is highly dependent on the magnetic orientation of the incoming CMEs. If the magnetic field aligns southward, it can enhance aurora activity; if northward, it may deflect energy and reduce visibility. The unpredictability of CME impacts means that aurora sightings are not guaranteed.

What's Next?

NOAA's forecast indicates that the best times to view the auroras are between 5 p.m. EDT on March 19 and 2 a.m. EDT on March 20, with moderate geomagnetic storming possible. A minor geomagnetic storm is expected between 2 a.m. and 5 a.m. EDT on March 20. The geomagnetic activity is expected to persist all night, with elevated levels if the CMEs arrive as predicted. The forecast suggests that aurora chances could remain elevated into March 21 due to the arrival of high-speed solar wind.

Beyond the Headlines

To improve your chances of seeing the auroras, find a location with a clear view to the north, away from city lights. Allow your eyes to adjust to the darkness for at least 30 minutes. Dress warmly, as aurora watching can involve extended periods outdoors. Consider using a space weather app for real-time aurora forecasts based on your location.

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