A total lunar eclipse will make the moon appear red across the Western Hemisphere during the "Blood Worm Moon" this week.

A total lunar eclipse will be viewable in the United States overnight into Friday morning, so some may want to pull an all-nighter to catch a good look at the rare celestial event, also known as the "blood moon.

Most of the U.S. should be able to see the total lunar eclipse tonight, but clouds will be problematic for many.