A G1-class geomagnetic storm is in progress, sparked by a high-speed solar wind stream which is buffeting Earth's magnetic field. High latitude sky watchers should be alert for auroras.

Shawn Malone sends this picture, taken before sunrise on April 12th, from Marquette, Michigan:

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© Shawn Malone
"I coaxed myself out of bed around 4am and was rewarded by a lightshow!" says Malone. "The auroras had no problem shining through the light pollution. I think the sun IS waking up. I watched the Northern Lights until the sunlight wiped them out."

More images: from Warren Gammel of Fairbanks, Alaska; from Doug Kiesling of Saint Cloud, MN.

NOAA forecasters estimate a 25% chance of more geomagnetic activity during the next 24 hours. Aurora alerts: voice, text.