My wife and i were soaking in the warm pool in calistoga, ca, facing north. the time was summer with a clear blue sky. suddenly, a glowing object passed in front of us from our left (west) to our right (east). it appeared to be a fireball with a trail of flames and gray smoke swirling directly and strictly behind the fireball. the smoke and flame trail did not pass beyond the width of the fireball. it was maybe 5 times as long as the diameter of the fireball in front. we heard no noise and felt no heat from it. it moved about as fast as a jet liner landing at an airport, and about that high and far away from our vantage point. it did not swerve or vary from a straight-line path as it disappeared over the horizon to our right. we saw no evidence of a crash landing. it just passed in front of us and was gone. the flyover event took less than 20 seconds or so. the pool had a dozen or so people in it, and they saw it, too. one man commented that it must be a meteorite and went on soaking. my wife was present and she saw it, but does not now have any recollection of the event. this exactly like the fireball i saw in 1988 that i reported in case 86767 but without any visit from a helicopter.