Any Unknown or Unlisted Aircraft Manufacturer
Air Traffic Control Fully Certified
Situational Awareness
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors
I told Aircraft X to expect ILS Runway 28R and descended the aircraft to FL50. I was expecting the aircraft to join the arrival and continue to the downwind. To his north/northwest; was a large moderate area of precipitation. It appeared that it would be better to turn the aircraft towards the north and take him on the east side of the weather which would provide less exposure to the growing weather in the area and provide an easy entry towards the final approach course. In doing so; I failed to amend the aircraft's assigned altitude that would be compatible with the MVA's that the aircraft would traverse on his new route. I noticed that the aircraft was descending below the MVA and issued an altitude compatible with the terrain and MVA; but not before the aircraft descended below the MVA. Honestly; I really don't know why I assigned him FL50; and even in the playback you can see I thought he was descending to 70. If I were to have kept the aircraft on the original route; there wouldn't have been any issue with the MVA. This happened in the last hour of my workweek to which I was fatigued. In the future; I would take extra steps to check altitude assigned and any clearances especially when I'm feeling fatigued.
TRACON Controller assigned an altitude below the MVA when vectoring to clear weather; the aircraft never actually descending below authorized altitudes.