If you find yourself in one of the 18 states listed above (or simply want to try your luck) head to a dark, north-facing spot away from city lights. As we approach the summer solstice on June 20/21, nights are growing shorter, so your best window for viewing may be in the early morning hours, around 1 to 2 a.m.

The agency's Space Weather Prediction Center classified the geomagnetic storm as a G2, the second lowest level on its G scale that sorts intensity from G1 (least) to G5 (most). The stunning natural phenomenon,