This special issue focuses on migrants' self-organised strategies in relation to housing in Europe, namely the collective squatting of vacant buildings and land. In particular, the contributions to this special issue differentiate between shelter provided in state-run or humanitarian camps and squatted homes. Migrants squats are an essential part of the 'corridors of solidarity' that are being created throughout Europe, where grassroots social movements engaged in anti-racist, anarchist and anti-authoritarian politics coalesce with migrants in devising non-institutional responses to the violence of border regimes. In these spaces contentious politics and everyday social reproduction uproot racist and xenophobic regimes. The struggles emerging in these spaces disrupt host-guest relations, which often perpetuate state-imposed hierarchies and humanitarian disciplining technologies. Moreover, the solidarities and collaborations between undocumented and documented activists challenge hitherto prevailing notions of citizenship and social movements, as well as current articulations of the common. These radical spaces enable possibilities for inhabitance beyond, against and within citizenship, which do not only reverse forms of exclusion and repression, but produce ungovernable resources, alliances and subjectivities that prefigure more livable spaces for all. Therefore, these struggles are interpreted here as forms of commoning, as they constitute autonomous socio-political infrastructures and networks of solidarity beyond and against the state and humanitarian provision

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Ensembles of numerical model forecasts are of interest to operational early warning forecasters as the spread of the ensemble provides an indication of the uncertainty of the alerts, and the mean value is deemed to outperform the forecasts of the individual models. This paper explores two ensembles on a severe weather episode in Spain, aiming to ascertain the relative usefulness of each one. One ensemble uses sensible choices of physical parameterizations (precipitation microphysics, land surface physics, and cumulus physics) while the other follows a perturbed initial conditions approach. The results show that, depending on the parameterizations, large differences can be expected in terms of storm location, spatial structure of the precipitation field, and rain intensity. It is also found that the spread of the perturbed initial conditions ensemble is smaller than the dispersion due to physical parameterizations. This confirms that in severe weather situations operational forecasts should address moist physics deficiencies to realize the full benefits of the ensemble approach, in addition to optimizing initial conditions. The results also provide insights into differences in simulations arising from ensembles of weather models using several combinations of different physical parameterizations.

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Radical and autonomous urban movements like the European squatters' movement tend to resist integration into the institutions of the state, although particular legal and political conditions in each country or city may significantly alter this tendency. In this article, I examine the controversial issue of ‘institutionalization’ among squatters, focusing on the few cases of legalized squats (social centres) in the city of Madrid. Negotiations with the state authorities and processes of legalization are the major forms of institutionalization involving squatters. However, an anomalous kind of institutionalization also emerges once squats, whether legalized or not, become consolidated and socially accepted. For squatting to have a successful impact, then, depends on both the type of autonomy achieved by squatters and the different outcomes of the processes of institutionalization. The case of Madrid provides empirical evidence that: (1) negotiations with state authorities were very frequent among squatters, but most were defensive; (2) the few cases of legalization were due to specific conditions such as the urban centrality of the squats, single‐issue identities, social network solidarity, favourable media coverage, formal organizations working as facilitators and the squatters' leadership of the process. Furthermore, legalized squats in Madrid preserved a high degree of autonomy, self‐management and ties to other radical social movements. In conclusion, both the legalized squats and the squatters' movement in Madrid as a whole, avoided ‘terminal institutionalization’ and, instead, gave shape to a ‘flexible’ one.

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