The Swedish Transport Administration is accountable for the long-term planning and management of the Swedish road infrastructure. An important factor for the safety on our roads is the weather. By predicting the weather it is possible to reduce the risk for accidents. There are stations that measure weather conditions along the roads with the greatest risk of slipperiness and snow drift. Monitoring of these weather station is executed with a  software for quality control of data deviations. The Swedish Transport Administration wants to replace the present interface for quality control with a more user-friendly system. In this thesis, a prototype for a new interface for quality control was created. The interface was developed in accordance with aspects for useful web design and criterias produced in the preliminary study which evaluated the present interface. The new interface displays data deviations as geovisualizations. The interface was developed by using the PostgreSQL, PostGIS, Geoserver, OpenLayers and GeoExt softwares. The usability of the interface was evaluated by the target audience it is designed for. The evaluation consisted of a heuristic evaluation with user tests and questionnaires. The outcome revealed that participants' satisfaction varied. The conclusion was that the usability of the interface is acceptable but that it has potential for improvement.