On a weather map of the northern hemisphere, one would observe the westerlies

Answer:

On a weather map of the 'northern hemisphere', one would observe the 'westerlies' between the 30° North latitude and the 60° North latitude.

Explanation:

The low-pressure belt characterized by the 'sub polar low' region in the 'northern hemisphere' is the one that is dominant around 60° North latitude. This region acts as a front made by the 'Polar Easterlies' and the 'Prevailing Westerlies'. The subtropical high-pressure belt (popularly known as 'Horse Latitudes') is existent around 30° North latitudes. The Westerlies in the northern hemispheres flow between these two latitudes.