Took a picture of some straight contrails while looking due east in Roseville, CA today around 3:30. The mountains shown at the bottom are near the edge of Desolation Wilderness, southwest of Lake Tahoe. For some reason I completely missed the big curvy contrail to the right of the photo and by the time I saw it while looking at the shot, I couldn't find it again.
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Tried to track it but FlightRadar's playback is temporarily disabled, so I'm dropping it here until they get it back up. There were a LOT of cool trails out there today, I was a bit stunned.
Did you see this thread? It has the explanation.