What is the best method for determining observed weather conditions?

Pilot reports are considered the best method for determining observed weather conditions because they provide first-hand accounts of weather experienced by pilots in real time. This valuable data captures localized and specific atmospheric conditions encountered during flight, such as turbulence, visibility, cloud cover, and significant weather phenomena. These reports are often gathered during actual flights and reflect conditions that may not be apparent through other methods.

While satellite imagery, ground observations, and weather radar all contribute useful information, they can lack the immediacy and specificity that pilot reports deliver. Satellite imagery provides a broader view but may not capture localized effects, and ground observations may not reflect conditions at altitude or over larger areas. Weather radar is effective for detecting precipitation and storm systems but does not provide direct reports on atmospheric conditions like turbulence or air quality that pilots may encounter in flight. Thus, pilot reports are an essential resource for understanding the nuances of weather as experienced in the flying environment.