I've never seen anything like that before. Fireball came to mind to describe it, though I wasn't sure that was correct. Not close at all to meteors, even bright ones.
Location
Address
Sinclair, WY
Latitude
41° 51' 34.92'' N (41.86°)
Longitude
107° 3' 5.39'' W (-107.05°)
Elevation
1957.01m
Time and Duration
Local Date & Time
2016-12-02 19:45 MST
UT Date & Time
2016-12-03 02:45 UT
Duration
≈3.5s
Direction
Moving direction
From up left to down right
Descent Angle
100°
Moving
Facing azimuth
123.19°
First azimuth
107.94°
First elevation
36°
Last azimuth
117.34°
Last elevation
33°
Brightness and color
Stellar Magnitude
-21
Color
Orange, White
Concurrent Sound
Observation
No
Remarks
-
Delayed Sound
Observation
No
Remarks
-
Persistent train
Observation
No
Duration
-
Length
-
Remarks
-
Terminal flash
Observation
Yes
Remarks
It was moving trailing the lights described and then seemed to explode with a bigger flash, and then was gone.