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Bogi (night) walu (eight), also known as aho valo in Tonga, refers to the period when there is a surge in the South East trade winds over the Fiji Group and neighboring Pacific states. Depending on the intensity of the subtropical high pressure (anticyclone) that develops to the South of Fiji, after the passage of a front system, the surge in the trade winds range between 20 to 25 knots and on occasions with an intense anticyclone, can reach up to 30 knots. The winds, on occasions last up to eight (walu) days while the anti-cyclone maintains its intensity and remained stationary to the south Fiji. As the weather systems that are responsible for the bogi walu continue moving eastwards, the trades usually subside after four to five days, and re-surges when the after next frontal band traverses the group. This pattern is most prevalent during the cool season when the 'cold cored' systems passing through Fiji are most frequent.