The Northern Lights will be visible across Canada, northern United States tonight

Space Weather Prediction Center:

A G2 (Moderate) Geomagnetic Storm Watch has been issued for 28-30 September 2016 due to effects from the anticipated arrival of a recurrent coronal hole high speed stream.

Those are big science-y words. If you live in most of Canada or in the most northerly parts of the contiguous United States, as well as parts of northern Europe, get outside tonight and look north to see this spectacular sky display.