(Portland, OR)  --  There's a chance the Northern Lights will be visible over Oregon's skies today or tomorrow.  The National Oceanic and Atmospheric Administration says due to plasma eruptions on the sun, the aurora might be visible across parts of Oregon, Montana, the Dakotas, Pennsylvania, Iowa, Minnesota, Wisconsin, northern Illinois, Michigan, northern New York State and much of New England.  If they are visible, NOAA forecasters say it will happen in the early morning hours before daybreak.