FQAU23 AMMC 172100

IDY10220

SECURITE



High Seas Forecast for Western METAREA 10

12S TO 30S BETWEEN 90E AND 125E, AND 30S TO 50S BETWEEN 80E AND 129E



Issued by the Australian Government Bureau of Meteorology

For 24 hours commencing 2300 UTC 17 September 2025



Part 1 Warnings

Refer to latest warnings for details of the area affected.



Melbourne Hurricane Force Wind Warning 10.

Melbourne Gale Warning 11.

Melbourne Gale Warning 12



Part 2 Situation at 171800 UTC

Cold front [1] near 41S116E 47S122E 50S122E. Forecast exiting area to east near

41S123E 48S131E 50S131E at 180300UTC.



Trough [1] near 35S121E 39S122E. Forecast weakening near 35S128E 39S129E at

180600UTC.



Trough [2] near 41S110E 45S106E. Forecast developing into cold front [2] near

37S121E 42S125E at 181200UTC, then exiting area to east near 36S126E 39S129E

42S130E at 181800UTC.



Forecast trough [3] approaching area from west near 43S075E 50S084E at

180600UTC, then near 40S080E 46S091E at 190000UTC.



Forecast warm front entering area from south near 47S109E 50S108E at 181500UTC,

then near 45S117E 50S116E at 190000UTC.



Part 3 Forecast

Refer to latest warnings for boundary of affected area and type of weather

system.



South of line 39S080E 34S115E 34S129E, outside warning areas:

Westerly quarter winds shifting northwesterly quarter within 240nm east of cold

front [1] and within 120nm east of warm front, and shifting southwesterly

quarter within 480nm west of trough [2] and cold front [2]. Wind speeds 20/33

knots. Rough to very rough seas. Moderate to heavy swell.



West of line 15S100E 21S115E 27S115E:

Southeasterly quarter winds 20/30 knots. Rough to very rough seas. Low to

moderate swell.



Remainder:

Winds not exceeding 25 knots. Moderate to rough seas. Low to moderate swell,

increasing to moderate to heavy south of line 28S094E 28S116E.



Rain areas, scattered showers and isolated thunderstorms mostly within 180nm of

fronts and troughs, and north of line 23S090E 23S107E. Visibility reducing

below 2nm in precipitation.



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.



WEATHER MELBOURNE



The next routine forecast will be issued at 09:00 UTC Thursday.