The adapted Middle Wallop technique: a new method of forecasting the fog point

The Middle Wallop technique, a method of forecasting visibility, has been adapted by Matt Woods to predict the fog point. A study retrospectively employed his technique for a number of historical fog case studies at Cardington, and results show the formation of fog was successfully predicted in 80–85% of studied cases. Additionally, the results reveal that, on occasion, the technique may give more accurate results than using Met Office NWP (Numerical Weather Prediction) data alone. Finally, a frequency analysis reveals that, on average, the observed fog point at Cardington is 3–4 degC depressed below its afternoon dew point, a finding supported by the technique.