Forecaster Performance Criterion 2.1f

Forecasting reduced visibility, onset and duration

Performance Criterion Description:

The forecaster must apply meteorological knowledge and skill in forecasting the occurrence, onset and duration of reduced visibility. 

Scenario:       

Throughout an assessment period the forecaster is asked to forecast visibility for the area of responsibility.

Evidence:

The forecaster must apply the appropriate forecasting knowledge and techniques to predict visibility including

conceptual models

• boundary layer interactions
• surface conditions
• climatology, seasonal and diurnal variations
• mechanisms of fog formation
• limitations of model fields and  statistical guidance
• threshold values of aeronautical products
• impact of reduced visibility (low visibility procedures, airport catagories)
• incorporates VFR/IFR threshold values for pilots
• obstructions to visibility including fog, mist, dust storms, smoke, haze, sand storms, blowing snow