Final answer:
Continental polar air masses typically do not impact the west coast of continents due to the maritime climate moderating temperatures and mountain ranges acting as barriers.
Step-by-step explanation:
The reasons why continental polar air masses do not have a significant impact on the west coast of continents are related to their formation and the geographic features that influence weather patterns. Continental polar air masses are cold, dry air masses that form over land in high latitude regions. Due to their cold nature, they do not carry much moisture and have a significant cooling effect on the regions they influence.
Firstly, the west coast of continents generally has a maritime influence due to their proximity to oceans. The water acts as a moderating force, creating milder temperatures compared to the interior of continents where continental polar air masses can exert more influence.
Secondly, the topography of the region can play a crucial role. Mountain ranges, such as the Rockies in North America, can act as a barrier to continental polar air masses, preventing them from reaching the coast. The westward flow of air is often obstructed by these mountains, resulting in the air masses losing their strength and cooling effect as they descend on the leeward side.