Approx 12 reddish/orange lights over downtown Seattle.Over a span of about five minutes, saw approximately 12 reddish lights in three loose formations traveling due west across downtown Seattle. The formations were variations on chevron/arrow shaped, regularly spaced and formation was held without wavering.The lights were reddish orange in colour and did not pulse or flicker. There were no other lights that would indicate that these were aircraft navigation lights. No discernible shape of the light or craft. No sound was heard over the background noise of the city.Unable to properly judge height, but based on the angle at which they passed behind a tall building, my angle to the building and assuming their speed was similar to that of a jet aircraft, I estimate that they were over 8,000 feet.((NUFORC Note: for some reason, witness indicates that the date of the sighting is approximate. PD))((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))