CHANGES UPON PASSAGE OF AN OCCLUDED FRONT
Condition Ahead of Front* Behind Front*
Cold Occlusion Warm Occlusion
Temperature Cold Colder Warmer
Pressure Falling Rising
Tdew - Lower Higher
Wind To right as one faces front (parallel to front) From back as one faces front (perpendicular to front)
Clouds Increasing well ahead of front Decreasing
Precipitation Well ahead of front Usually most intense on frontal line, but exceptions are common.  Can trail front considerably.

*Prefrontal conditions are much like those preceding a warm front.  Postfrontal conditions
  are much like those behind a cold front.  Exceptions are the transitions in temperature and
  dew point which occur right at the front.  Those are like a cold front for a cold occlusion
  but like a warm front for a warm occlusion.

  Like warm fronts, occluded fronts are much more common east of the Rockies than in the
  West.  Cold occlusions are most likely to occur during the warmer months of the year. 
  Warm occlusions, which are rarer than cold occlusions, are more common during the
  colder months.