This study explores how disasters are framed and politicised in the media to provide a systematic assessment of discursive dynamics and external political contexts of natural hazards. Utilising an actor-focused approach, it contributes with knowledge on how politicisation of disaster discourses unfolds. Two similar natural hazard events, the United Kingdom floods of 2005 and 2015, are investigated by means of a content analysis and a political claims analysis. The study finds that a tension between the national government and its contestants following the 2015 floods led to a framing contest which was heavily affected by the external political context at the time. The opposition and journalists constructed a narrative of government failure, not least by intertwining the event with the politically tense situation in the United Kingdom to further populist claims about government spending and EU policies. In 2005, the lack of a comparable external context and polarisation between actors in the media prevented a politicisation of the floods in the immediate aftermath of the disaster. These results illustrate the importance of broader political contexts, even those essentially unrelated to the natural hazard, for the politicisation of a disaster.