IDY21030 40:2:1:04:70S075E35060:01:00 SECURITE High Seas Weather Warning for METAREA 10 Issued by the Australian Government Bureau of Meteorology At 1759UTC 17 September 2025 GALE WARNING 4 FOR SOUTHERN AREA SITUATION AT 171800UTC Vigorous westerly flow associated with forecast low 978hPa near 52S073E at 180000UTC, then low 970hPa near 55S082E at 180600UTC, low 963hPa near 58S088E at 181200UTC, and low 961hPa near 59S094E at 181800UTC. AREA AFFECTED Bounded by 50S080E 54S100E 58S099E 60S090E 55S080E 50S080E FORECAST Westerly quarter winds 30/40 knots within 240nm of low in northern semicircle developing by 180600UTC, transitioning to westerly quarter winds 34/47 knots within 360nm of low in northern semicircle by 181200UTC. Rough to very rough seas. Moderate to heavy swell. PLEASE BE AWARE Wind and wave forecasts are averages. Wind gusts can be 40 per cent stronger than the forecast, and stronger still in squalls and thunderstorms. Maximum waves can be twice the forecast height. The next alert will be issued by 0100 UTC 18 September 2025