Medium Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Confusion; Situational Awareness
Inflight Event / Encounter CFTT / CFIT
Flight Crew Executed Go Around / Missed Approach
Airport; Environment - Non Weather Related; Equipment / Tooling; Human Factors; Weather
Landing in JAN; isolated showers around the field; thunderstorms South/SE. We reported the field in sight. Approach advised showers 3-4 mile final and asked if we would be able to maintain sight of the runway. We replied that we would keep the turn to final inside 4 miles; and if we lost sight of the field we would advise ATC. We were cleared for the visual approach; backed up by the RNAV/GPS. At approximately 300-500 feet we got the 'Too Low; Terrain' GPWS caution message. The FO executed a missed approach; we advised Tower; climbed to 3000 ft; and were then re-vectored for another approach. This time we opted for the actual RNAV/GPS; rather than the visual. Approach and landing were uneventful. Although the glide angle; to both of us; appeared to be unusually steep.Tower later said they couldn't figure out why we would be going missed; since they had us in sight the entire time and landing was assured. We informed them it was policy to go-around after a GPWS Terrain message. Only threats were the rainy weather; dark night; and a long day. No errors.All I can figure; is that with the close-in turn to final on the visual approach; it may be possible the GPS didn't have time to recognize we were right over the runway. In hindsight; the best option would have been to ask for the full RNAV approach; rather than accepting the visual in rainy night-time conditions.
[Report narrative contained no additional information.]
Air carrier flight crew reported a GPWS activation on short final to JAN at night in marginal VFR conditions.