B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 220; Flight Crew Total 11700; Flight Crew Type 4000
Confusion
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Chart Or Publication; Weather
Landed on Runway in low visibility and with runway markings obscured by snow and blowing snow.  When we sighted the runway about 2 miles out I could not identify any threshold markings or lighting in the snow-covered surface.  Per the instructions on 10-7 I was targeting the area short of the PAPI lights as the aim point (supposed to touch down within the first 1000 feet of the runway).  After landing and taxiing back near the touchdown area the first officer stated that the PAPI lights appeared to possibly be located right near the threshold.  After reaching the hotel I consulted an NOS approach plate for the airport and noted that the location of the PAPI was marked at the threshold (the Jeppesen had no information about the PAPI location).  If it was in fact at this nonstandard location it is possible that we touched down in the overrun.  If the PAPI was at the normal position 1000 feet down the runway then we touched down normally on the runway surface.
[Report narrative contained no additional information.]
Because of low visibility; the flight crew used the PAPI as a touchdown aim point. On taxi in; they observed the PAPI to be near the runway threshold; and thought they may have touched down short of the runway.