When first entering the weather monitoring station, it will appear as a small square room, with an indent holding two desks and a broken terminal to the left. Further exploring the small room reveals a large control station on the right. If the Courier has the platinum chip it can be placed it in the control station, and it will open up two large doors built into the right half of the floor. The doors open to a staircase, which lead down into a circular room. The circular room has the Lucky 38 symbol upon a door at the far end. Entering will lead to the securitron vault.
The weather monitoring station appears only in Fallout: New Vegas.