A front that spirals counterclockwise in the northern hemisphere is called a low-pressure system.

Here's why:

* Low-pressure systems are characterized by rising air, which cools and condenses, leading to cloud formation and often precipitation.

* The Coriolis effect causes air to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. This deflection results in a counterclockwise rotation around a low-pressure system in the Northern Hemisphere.

Important Note: This is a simplification. The actual rotation of a low-pressure system is influenced by multiple factors, including the pressure gradient, the Coriolis effect, and friction.