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This paper analyses how British counter-radicalisation policy, and the Channel project in particular, constitutes individuals who are vulnerable to radicalisation as visible, producing them as subjects of intervention. It thus asks, how can potential terrorists be identified and made knowable? The paper first argues that to understand Channel, it is crucial to develop a conceptual account of the security politics of (in)visibilisation that draws attention to the ways in which security regimes can, at times, function primarily through the production of regimes of (in)visibility. Utilising this approach, the paper focusses on the role of 'indicators' as a technology of (in)visibilisation, producing certain subjects as newly visibilised as threatening: a role that is central to the functioning of Channel. Yet such a production is political. In bringing together a politics of care and a politics of identity, it is a regime of (in)visibility that produces new sites of intervention, contains significant potential consequences for the expression of certain identities, and raises new and troubling possibilities for how contemporary life may be secured.

Abstract. Organised cloud bands are important features of tropical and subtropical rainfall. These structures are often regarded as convergence zones, alluding to an association with coherent atmospheric flow. However, the flow kinematics is not usually taken into account in classification methods for this type of event, as large-scale lines are rarely evident in instantaneous diagnostics such as Eulerian convergence. Instead, existing convergence zone definitions rely on heuristic rules of shape, duration and size of cloudiness fields. Here we investigate the role of large-scale turbulence in shaping atmospheric moisture in South America. We employ the finite-time Lyapunov exponent (FTLE), a metric of deformation among neighbouring trajectories, to define convergence zones as attracting Lagrangian coherent structures (LCSs). Attracting LCSs frequent tropical and subtropical South America, with climatologies consistent with the South Atlantic Convergence Zone (SACZ), the South American Low-Level Jet (SALLJ) and the Intertropical Convergence Zone (ITCZ). In regions under the direct influence of the ITCZ and the SACZ, rainfall is significantly positively correlated with large-scale mixing measured by the FTLE. Attracting LCSs in south and southeast Brazil are associated with significant positive rainfall and moisture flux anomalies. Geopotential height composites suggest that the occurrence of attracting LCSs in these regions is related with teleconnection mechanisms such as the Pacific–South Atlantic. We believe that this kinematical approach can be used as an alternative to region-specific convergence zone classification algorithms; it may help advance the understanding of underlying mechanisms of tropical and subtropical rain bands and their role in the hydrological cycle.

The "Trojan Horse" scandal laid bare an anxiety at the heart of the British security establishment; an anxiety that brings together questions of identity, values, and security within the demand to manage radicalization. It is an anxiety that, I will argue, reveals a novel conceptualization of threat that has driven the UK's security and communities policies within the "war on terror." This conceptualization emerges within Prevent, the UK's counter-radicalization strategy. Yet, I argue, the extensive literature on Prevent has failed to adequately articulate this underlying, core logic. To date, the Prevent literature has effectively demonstrated the ways in which Muslim communities in the United Kingdom have been policed through British counter-radicalization policy. Yet, this analysis struggles to explain the expansion of Prevent into a wider range of "extremist" spaces. In this article, I contend that it is more useful to situate Prevent as a particular conception of power; a logic and an analysis of threat that demands new forms of government intervention. To do so, this article provides a genealogical reading of Prevent, locating it as a radical extension of state security ambitions to intervene early, making explicit a vision of security in which life as a process of becoming is produced as an object of management.The paper draws out the ramifications of this analysis to think through fundamental shifts in the principles and practices of contemporary security aspirations.

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