The very large Tropical Cyclone Winston (Cat. 4) currently has hurricane force winds across its 150kms diameter and the intensifying storm might become a high Cat. 4 – or even Cat. 5, sometime before midday Friday, north of Vava’u, warns Tonga Met. NEMO was meeting this afternoon and may possibly declare a state of emergency for Tonga later today, based on emerging models of the intensifying and dangerous storm.