As the sunspot ejects energy just as it's facing earth, it generates a geomagnetic storm.
The sky spectacle should be visible in states such as Montana, the Dakotas, Minnesota, Wisconsin, northern Illinois, Michigan, northern New York State and much of New England, according to NOAA's Space Weather Prediction Center.
Forget yesterday's news. Get what you need today in this early-morning email. It means conditions are favorable for the occurrence, but it's not a sure bet.
The aurora borealis - the "Northern Lights" - is a region of charged gases in the ionosphere, a region around 50 miles above the earth's surface.
These are the dancing lights seen in the skies above the northern and southern hemispheres.More news: The PNC Financial Services Group, Inc
There are many sources for the latest solar activity and real-time Kp levels.
The lights are visible in both the far northern and southern parts of the world. This site allows you to subscribe to text alerts for a small fee.
Scientists are already getting excited about this CME and possible aurora.
But this weekend might also offer an opportunity for Lower Mainlanders to see the Northern Lights, which are also called Aurora Borealis.
What we are hoping is for the ovation maps which show the aurora to have that green line running through the area Sunday night. Auroras tend to come in pulses, and don't last long. Location, location, location! The farther north you are and the darker your surroundings, the more vibrant the aurora will appear.