In general observed precipitation is significantly weaker than in fronts, or there may be no precipitation at all.

Parameter	Description
Precipitation	No active front: large areas with no precipitation Modification of old systems: remains of precipitation activity, light rain and drizzle Upper Level Low: Precipitation at tear - off stage
Temperature	No connection (stationary)
Wind (incl. gusts)	No connection (stationary)
Other relevant information

Example: To the rear of a synoptic scale trough, in the area of northern Spain and SW France.