UNUSUAL LIGHTS OVER SEATTLE DURING A DAYTIME PASS OF THE ISS

ALMOST DIRECTLY OVERHEAD IN LATE AFTERNOON CLEAR SKY CONDITIONS WE OBSERVED AN EQUILATERAL TRIANGLE OF DIMLY VISIBLE LIGHTS AND A SIMILAR SINGLE LIGHT SOME DISTANCE AWAY FROM IT. THE OBJECTS WERE MOVING SLOWLY ON A SOUTHWEST TO NORTHEAST TRACK.  THE SINGLE LIGHT VANISHED FIRST. THE THREE-LIGHT TRIANGLE REMAINED VISIBLE FOR A MINUTE OR SO LONGER, CONTINUING ITS NORTHEASTERLY DRIFT BEFORE VANISHING IN THE SAME WAY THE FIRST ONE HAD. BY THIS I MEAN IT JUST WENT OUT AS THOUGH AN "OFF" SWITCH HAD BEEN THROWN.
THIS EVENT OCCURRED AT THAT THE EXACT TIME THE INTERNATIONAL SPACE STATION WAS PASSING OVER SEATTLE BUT THE APPARENT MOTION OF THE OBJECTS WAS NOT NEARLY THE SAME AS THAT OF THE ISS WHICH MOVES FROM THE NORTHWEST TO THE SOUTHEAST. THE ISS WAS NOT VISIBLE TO US ON THAT PASS DUE TO THE DAYLIGHT BUT I DID SEE IT ON ITS NEXT PASS TO THE WEST BECAUSE IT WAS DARK BY THEN.