I have a couple pics of the spiral smoke Trail if interested.
Location
Address
Concord, CA
Latitude
37° 58' 34.55'' N (37.976263°)
Longitude
122° 2' 23.95'' W (-122.039987°)
Elevation
15.632m
Time and Duration
Local Date & Time
2018-04-30 01:42 PDT
UT Date & Time
2018-04-30 08:42 UT
Duration
?
Direction
Moving direction
From up right to down left
Descent Angle
247°
Moving
Facing azimuth
306.99°
First azimuth
315.07°
First elevation
59°
Last azimuth
123.65°
Last elevation
-
Brightness and color
Stellar Magnitude
-
Color
Na
Concurrent Sound
Observation
Unknown
Remarks
-
Delayed Sound
Observation
Unknown
Remarks
-
Persistent train
Observation
Yes
Duration
99.99s
Length
99.99°
Remarks
Tight spiral smoke tail.from my balcony at 130* N.W. traveling E./S.E. landing in horizon on the right side of Mt Diablo.( South by South East side). A jet flew parallel to the Smoke train less approximately 1-2 minutes after. Starting at the end point of the smoke Trail and traveled towards its beginning. The smoke Trail lasted several minutes and slowly moved North with the winds and slowly dissipated.
