(Portland, OR) -- A fireball was seen over the Pacific Northwest Saturday evening. The American Meteor Society reports it happened around 8:40 p.m. Some reports say it was orange, others say it was blue. Experts at OMSI say orange or red can come from the ionization of atmospheric nitrogen and oxygen at high altitude. Blue can indicate the presence of magnesium, nickel or copper. The sightings come less than a week after a green fireball was spotted over the region.