In the early 20th century, forecasting the track of cyclones was still confined to areas of the greatest surface pressure falls, based upon surface weather observations, and climatology. These methods proved to be the cutting edge of tropical cyclone forecasting through the mid 20th century.
During the early 20th century, predicting cyclones' tracks relied on areas with substantial surface pressure declines, based on surface weather observations and climatology. These methods were considered cutting-edge for tropical cyclone prediction throughout most of the 20th century.