Which weather element is NOT typically observed by a Surface Weather Observer?

A Surface Weather Observer is responsible for monitoring and reporting various weather elements that directly relate to atmospheric conditions. These observers commonly track temperature, humidity, and wind speed, as these elements significantly impact weather reports and forecasts.

Earthquake activity, however, falls outside the domain of surface weather observation. While it is a natural phenomenon, it is not related to meteorological observations. Instead, earthquake activity is monitored by specialized seismic networks and geologists who study tectonic movements. Therefore, it does not fall within the responsibilities or training of a Surface Weather Observer, making it the element that is not typically observed in their routine assessments.