Some Pennsylvanians could see the northern lights – also known as the aurora borealis – tonight if an approaching solar storm is strong enough and the cloud cover clears.
A strong solar storm is expected Wednesday through Friday, according to the Space Weather Prediction Center of the National Oceanic and Atmospheric Administration.
It could be a G3 storm on Wednesday and that could produce a value of 7 on the Kp index, which ranges from 0 to 9 with a value of 0 indicating very little geomagnetic activity and a value of 9 indicating extreme geomagnetic storming.
A Kp value of at least 7 is required for the northern lights to be seen south of the Pennsylvania-New York state line, in only northern areas of the state.
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