US Ops spec C54
 

part b. of US ops specs C54 requires under paragraph 2. section (b) Precision (all weather) runway markings or runway centerline lights are operational on that runway.

Regards to the precision (all weather) runway markings (assuming there are no CLL's) how do I know that there are precision runway markings (could a runway served by a NPA or no approach at all have precision runway markings?) by referencing the jeps. And, can they be obscured by snow and still meet the requirments established for not needing and extra 15% additional runway?