Final answer:
Counterclockwise arrows on a weather map in the Northern Hemisphere indicate the direction of wind around a low-pressure system, influenced by the Coriolis force, which causes this rotation.
Step-by-step explanation:
The arrows pointing counterclockwise on a surface weather map represent the movement of wind around a low-pressure system in the Northern Hemisphere.
This pattern is directly influenced by the Coriolis force, which deflects winds to the right in the Northern Hemisphere, causing a counterclockwise circulation when viewed from above. Low-pressure systems are associated with rising air, cooling, cloud formation, and can be linked to various weather conditions, including storms and tropical cyclones. Meteorologists use weather maps with isobars, which are lines of constant pressure, to indicate these pressure systems. High-pressure systems, alternatively, are associated with sinking air and clear skies, and in the Northern Hemisphere, the wind circulates clockwise around them.
However, it's important to note that the wind circulation patterns are reversed in the Southern Hemisphere due to the Coriolis force acting in the opposite direction.