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GridStat is a QoS-managed publish-subscribe data delivery service designed for the specific needs of delivering real-time operational data for the electric power grid and other critical infrastructures. GridStat's data plane delivers data updates through a network of middleware-level forwarding engines. Subscriptions are managed by GridStat's hierarchical QoS management plane. In a crisis, many entities may suddenly wish to add a large number of subscription requests, which would in practice overwhelm the subscription allocation mechanisms. In this paper, we present a mechanism called modes, which lets GridStat change routing tables quickly. Two different algorithms are presented with experimental evaluation.