Try this: (Score 1)

Looking outside will do nothing for you, Give NOAA space weather a try! When a geomagnetic storm is in progress keep an eye out on the auroral oval and how far it reaches down in the picure. If your sky area is clear and the storm is not strong the lights can look like faint clouds that move slowly. (Keep an eye on these as they can break out and get stronger) Most people will want to use a camera with a long exposure setting (bulb mode) to see them.