Final answer:
The synoptic scale in atmospheric motions usually covers a range of 1,000 to 10,000 kilometers and is associated with weather patterns and systems lasting for several days to a week.
Step-by-step explanation:
The typical size of the synoptic scale in atmospheric motions covers a range of approximately 1,000 kilometers to 10,000 kilometers. This scale is often associated with weather patterns and systems that have a lifespan of several days to a week. Examples of synoptic scale phenomena include mid-latitude cyclones, which are large-scale low-pressure systems that typically bring changes in weather over a region, and anticyclones, which are large-scale high-pressure systems associated with fair weather conditions.