An objective Visibility Analysis/Forecast System has been developed as part of Nimrod, the United Kingdom Meteorological Office (UKMO) very-short-range forecasting system. The analysis blends satellite imagery and surface observations with a one-hour forecast using a variational algorithm. An extrapolation forecast is produced by adding UKMO Mesoscale Model (MM) trends to the analysis values. This is merged with persistence (the analysis) and MM values, to produce the final forecast. Results from eight case studies are presented, showing the potential of the system, which demonstrates significant improvements on the MM predictions (the currently available objective forecast method).